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Long-Term Debt and Lines of Credit - Schedule of Long-term Debt, Net of Current Portion (Details) - USD ($) | Jun. 30, 2016 | Sep. 30, 2015 | Dec. 03, 2014
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Debt Instrument [Line Items] |  |  |
Long-term debt, net of current portion | $ 199,901,000 | $ 205,481,000 |
Less current portion | 4,493,000 | 4,511,000 |
Long-term debt | 195,408,000 | 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, are collateralized by real estate and mature in November 2029. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, net of current portion | 106,875,000 | 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 approximately 2.14% per annum as of June 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 | $ 53,188,000 | $ 55,344,000 | $ 57,500,000
Principal amount | $ 57,500,000 |  |
Variable interest rate | 2.14% | 1.80% |
Metropolitan Life Insurance Company term loan: the loan bears interest at the rate of 5.28% per annum as of June 30, 2016. The loan is collateralized 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 June 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 | $ 24,480,000 | 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 June 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 | $ 5,170,000 | 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 June 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 | $ 5,170,000 | 5,335,000 |
Fixed interest rate | 3.45% |  |
Note payable to a financing company collateralized by equipment and matures in December 2016. |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, net of current portion | $ 18,000 | $ 54,000 |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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