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Long-Term Debt and Lines of Credit - Schedule of Long-term Debt, Net of Current Portion (Details) - USD ($) | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 03, 2014 | Dec. 02, 2014 | Sep. 30, 2014
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Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, net of current portion | $ 197,219,000 | $ 205,481,000 |  |  |
Less current portion | 4,493,000 | 4,511,000 |  |  |
Long-term debt | 192,726,000 | 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 | 105,312,000 | 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 amount of $57,500,000: the variable interest rate was 2.25% per annum at September 30, 2016. The loans are collateralized by real estate and mature in November 2029. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, net of current portion | $ 52,469,000 | $ 55,344,000 | $ 57,500,000 | $ 33,500,000 |
Principal amount | $ 57,500,000 |  |  |  |
Variable interest rate | 2.25% | 1.80% |  |  | 2.40%
Metropolitan Life Insurance Company term loan: the loan bears interest at the rate of 5.28% per annum as of September 30, 2016. The loan is secured by real estate and matures in February 2029. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, net of current portion | $ 5,000,000 | $ 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 as of September 30, 2016. The loans are collateralized by real estate and mature in June 2033. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, net of current portion | $ 24,190,000 | 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 September 30, 2016. The loan is collateralized by real estate and matures in September 2021. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, net of current portion | $ 5,115,000 | 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 September 30, 2016. The loan is collateralized by real estate and matures in September 2039. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, net of current portion | $ 5,115,000 | 5,335,000 |  |  |
Fixed interest rate | 3.45% |  |  |  |
Note payable to a financing company secured by equipment and maturing in December 2016. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, net of current portion | $ 18,000 | $ 54,000 |  |  |

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