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 ($)
Apr. 27, 2016
Mar. 31, 2016
Sep. 30, 2015
Dec. 03, 2014
Debt Instrument [Line Items]        
Long-term debt, net of current portion   $ 200,100,000 $ 205,481,000  
Less current portion   4,511,000 4,511,000  
Long-term debt   195,589,000 200,970,000  
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. The loans are collateralized by real estate and mature in November 2029.        
Debt Instrument [Line Items]        
Long-term debt, net of current portion   108,438,000 111,563,000 $ 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 2.12% per annum as of March 31, 2016. The loans are collateralized by real estate and mature in November 2029.        
Debt Instrument [Line Items]        
Long-term debt, net of current portion   $ 53,906,000 55,344,000 $ 57,500,000
Principal amount   $ 57,500,000    
Variable interest rate   2.12%    
Metropolitan Life Insurance Company term loan: the loan bears interest at the rate of 5.30% per annum as of March 31, 2016. A final advance of $2,500,000 was made on April 27, 2016. The interest rate was adjusted to 5.28% 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  
Fixed interest rate   5.30%    
Metropolitan Life Insurance Company term loan: the loan bears interest at the rate of 5.30% per annum as of March 31, 2016. A final advance of $2,500,000 was made on April 27, 2016. The interest rate was adjusted to 5.28% on the date of the final advance. The loan is collateralized by real estate and matures in February 2029. | Subsequent Event        
Debt Instrument [Line Items]        
Final advance $ 2,500,000      
Fixed interest rate 5.28%      
Prudential Mortgage Capital Company, LLC fixed rate term loans: the loans bear interest at the rate of 5.35% per annum. The loans are collateralized by real estate and mature in June 2033.        
Debt Instrument [Line Items]        
Long-term debt, net of current portion   $ 24,770,000 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. The loan is collateralized by real estate and matures in September 2021.        
Debt Instrument [Line Items]        
Long-term debt, net of current portion   $ 5,225,000 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 March 31, 2016. The loan is collateralized by real estate and matures in September 2039.        
Debt Instrument [Line Items]        
Long-term debt, net of current portion   $ 5,225,000 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