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Cash and Credit Facilities - Summary of Loan Facilities and Subordinated Debt Financing (Details) | 12 Months Ended |
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Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, effective percentage | 1.24% |
Fixed charge coverage ratio | 0.0135 |
Ratio of debt to EBITDA, period one | 0.0299 |
Ratio of debt to EBITDA, period two | 3.25 |
Ratio of debt to EBITDA, period three | 0.025 |
Bank term loan |  |
Debt Instrument [Line Items] |  |
Maximum availability | $ 25,000,000 |
Bank term loan | Term Loan with Fifth Third Bank |  |
Debt Instrument [Line Items] |  |
Maximum availability | $ 25,000,000 |
Debt instrument, payment term for consecutive monthly installments | 59 months |
Line of credit facility, periodic payment, principal | $ 312,500,000 |
Bank term loan | LIBOR |  |
Debt Instrument [Line Items] |  |
Debt instrument, basis spread on variable rate | 3.00% |
Bank revolving line of credit |  |
Debt Instrument [Line Items] |  |
Maximum availability | $ 10,000,000 |
Bank revolving line of credit | LIBOR |  |
Debt Instrument [Line Items] |  |
Debt instrument, basis spread on variable rate | 3.00% |
Notes Payable to Banks |  |
Debt Instrument [Line Items] |  |
Bank term loan | $ 19,688,000 |
Notes Payable to Banks | Bank term loan |  |
Debt Instrument [Line Items] |  |
Bank term loan | 19,688,000 | $ 23,438,000
Notes Payable to Banks | Bank revolving line of credit |  |
Debt Instrument [Line Items] |  |
Bank term loan | $ 0 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: 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 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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