Long-Term Debt and Lines of Credit (Tables)
   | 
6 Months Ended | 
Mar. 31, 2017  | 
| Debt Disclosure [Abstract] | 
 
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| Schedule of long-term debt, net of current portion | 
The following table summarizes long-term debt and related deferred financing costs net of accumulated amortization at March 31, 2017 and September 30, 2016:
 
  
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   | 
March 31, 2017  | 
   | 
September 30, 2016  | 
 
   | 
Principal  | 
   | 
Deferred Financing Costs, Net  | 
   | 
Principal  | 
   | 
Deferred Financing Costs, Net  | 
 
   | 
(in thousands)  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Long-term debt, net of current portion:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
Met Fixed-Rate Term Loans  | 
$  | 
102,188  | 
 
  | 
   | 
$  | 
1,016  | 
 
  | 
   | 
$  | 
105,312  | 
 
  | 
   | 
$  | 
1,080  | 
 
  | 
 
Met Variable-Rate Term Loans  | 
51,030  | 
 
  | 
   | 
467  | 
 
  | 
   | 
52,469  | 
 
  | 
   | 
497  | 
 
  | 
 
Met Citree Term Loan  | 
5,000  | 
 
  | 
   | 
51  | 
 
  | 
   | 
5,000  | 
 
  | 
   | 
53  | 
 
  | 
 
Pru Loans A & B  | 
23,610  | 
 
  | 
   | 
266  | 
 
  | 
   | 
24,190  | 
 
  | 
   | 
274  | 
 
  | 
 
Pru Loan E  | 
5,005  | 
 
  | 
   | 
29  | 
 
  | 
   | 
5,115  | 
 
  | 
   | 
32  | 
 
  | 
 
Pru Loan F  | 
5,005  | 
 
  | 
   | 
43  | 
 
  | 
   | 
5,115  | 
 
  | 
   | 
44  | 
 
  | 
 
John Deere equipment loan  | 
—  | 
 
  | 
   | 
—  | 
 
  | 
   | 
18  | 
 
  | 
   | 
—  | 
 
  | 
 
   | 
191,838  | 
 
  | 
   | 
1,872  | 
 
  | 
   | 
197,219  | 
 
  | 
   | 
1,980  | 
 
  | 
 
Less current portion  | 
4,500  | 
 
  | 
   | 
—  | 
 
  | 
   | 
4,493  | 
 
  | 
   | 
—  | 
 
  | 
 
Long-term debt  | 
$  | 
187,338  | 
 
  | 
   | 
$  | 
1,872  | 
 
  | 
   | 
$  | 
192,726  | 
 
  | 
   | 
$  | 
1,980  | 
 
  | 
 
  
 
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| Schedule of lines of credit | 
The following table summarizes lines of credit and related deferred financing costs net of accumulated amortization at March 31, 2017 and September 30, 2016:
 
  
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   | 
March 31, 2017  | 
   | 
September 30, 2016  | 
 
   | 
Principal  | 
   | 
Deferred Financing Costs, Net  | 
   | 
Principal  | 
   | 
Deferred Financing Costs, Net  | 
 
   | 
(in thousands)  | 
 
   | 
   | 
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Lines of Credit:  | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
RLOC  | 
$  | 
11,417  | 
 
  | 
   | 
$  | 
134  | 
 
  | 
   | 
$  | 
5,000  | 
 
  | 
   | 
$  | 
159  | 
 
  | 
 
WCLC  | 
—  | 
 
  | 
   | 
130  | 
 
  | 
   | 
—  | 
 
  | 
   | 
230  | 
 
  | 
 
Lines of Credit  | 
$  | 
11,417  | 
 
  | 
   | 
$  | 
264  | 
 
  | 
   | 
$  | 
5,000  | 
 
  | 
   | 
$  | 
389  | 
 
  | 
 
  
  
 
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| Schedule of future maturities of debt and lines of credit | 
Future maturities of debt and lines of credit as of March 31, 2017 are as follows:
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(in thousands)  | 
   | 
 
   | 
   | 
 
Due within one year  | 
$  | 
4,500  | 
 
  | 
 
Due between one and two years  | 
19,767  | 
 
  | 
 
Due between two and three years  | 
10,938  | 
 
  | 
 
Due between three and four years  | 
10,975  | 
 
  | 
 
Due between four and five years  | 
10,975  | 
 
  | 
 
Due beyond five years  | 
146,100  | 
 
  | 
 
Total future maturities  | 
$  | 
203,255  | 
 
  | 
 
  
  
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| Schedule of interest costs expensed and capitalized | 
Interest costs expensed and capitalized were as follows: 
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(in thousands)  | 
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   | 
Three Months Ended March 31,  | 
   | 
Six Months Ended March 31,  | 
 
   | 
2017  | 
   | 
2016  | 
   | 
2017  | 
   | 
2016  | 
 
Interest expense  | 
$  | 
2,374  | 
 
  | 
   | 
$  | 
2,475  | 
 
  | 
   | 
$  | 
4,701  | 
 
  | 
   | 
$  | 
4,978  | 
 
  | 
 
Interest capitalized  | 
64  | 
 
  | 
   | 
38  | 
 
  | 
   | 
127  | 
 
  | 
   | 
81  | 
 
  | 
 
Total  | 
$  | 
2,438  | 
 
  | 
   | 
$  | 
2,513  | 
 
  | 
   | 
$  | 
4,828  | 
 
  | 
   | 
$  | 
5,059  | 
 
  | 
 
  
 
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