Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Lines of Credit - Schedule of Long-term Debt, Net of Current Portion (Details)

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Long-Term Debt and Lines of Credit - Schedule of Long-term Debt, Net of Current Portion (Details) - USD ($)
 3 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Dec. 03, 2014
Debt Instrument [Line Items]      
Long-term debt, net of current portion $ 202,781,000 $ 205,481,000  
Less current portion 4,511,000 4,511,000  
Long-term debt 198,270,000 200,970,000  
Metropolitan Life Insurance Company and New England Life Insurance Company fixed rate term loans in the original principal amount of $125,000,000: the loans bear interest at the rate of 4.15% per annum as of December 31, 2015. The loans are collateralized by real estate and mature in November 2029.      
Debt Instrument [Line Items]      
Long-term debt, net of current portion 110,000,000 111,563,000 $ 125,000,000
Principal amount $ 125,000,000    
Fixed interest rate 4.15%   4.15%
Metropolitan Life Insurance Company and New England Life Insurance Company variable rate term loans in the original principal amounts of $57,500,000: the variable interest rate was approximately 1.82% per annum as of December 31, 2015. The loans are collateralized by real estate and mature in November 2029.      
Debt Instrument [Line Items]      
Long-term debt, net of current portion $ 54,625,000 55,344,000 $ 57,500,000
Principal amount $ 57,500,000    
Variable interest rate 1.82%    
Metropolitan Life Insurance Company term loan: the loan bears interest at the rate of 5.30% per annum as of December 31, 2015. A final advance of $2,500,000 is scheduled for March 1, 2016 subject to certain performance conditions. The interest rate is subject to adjustment on the date of the final advance. The loan is collateralized by real estate and matures in February 2029.      
Debt Instrument [Line Items]      
Long-term debt, net of current portion $ 2,500,000 2,500,000  
Final advance $ 2,500,000    
Fixed interest rate 5.30%    
Prudential Mortgage Capital Company, LLC fixed rate term loans: the loans bear interest at the rate of 5.35% per annum as of December 31, 2015. The loans are collateralized by real estate and mature in June 2033.      
Debt Instrument [Line Items]      
Long-term debt, net of current portion $ 25,060,000 25,350,000  
Fixed interest rate 5.35%    
Prudential Mortgage Capital Company, LLC fixed rate term loan: the loan bears interest at the rate of 3.85% per annum as of December 31, 2015. The loan is collateralized by real estate and matures in September 2021.      
Debt Instrument [Line Items]      
Long-term debt, net of current portion $ 5,280,000 5,335,000  
Fixed interest rate 3.85%    
Prudential Mortgage Capital Company, LLC fixed rate term loan: the loan bears interest at the rate of 3.45% per annum as of December 31, 2015. The loan is collateralized by real estate and matures in September 2039.      
Debt Instrument [Line Items]      
Long-term debt, net of current portion $ 5,280,000 5,335,000  
Fixed interest rate 3.45%    
Note payable to a financing company collateralized by equipment and maturing in December 2016.      
Debt Instrument [Line Items]      
Long-term debt, net of current portion $ 36,000 $ 54,000