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Borrowing Arrangements (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended | 84 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Nov. 25, 2021
Agreement termination date | Jul. 13, 2021 |  |  |
Loss on early extinguishment of debt | $ 0 | $ 0 | $ 31,300 |
Gain (Loss) on Repurchase of Debt Instrument |  |  | 25,200 |
Write off of Deferred Debt Issuance Cost |  |  | 4,400 |
Debtor Reorganization Items, Write-off of Debt Issuance Costs and Debt Discounts |  |  | 1,700 |
Future maturities of outstanding borrowings |  |  |  |
CY plus 1 | 5,600 |  |  |
CY plus 2 | 5,400 |  |  |
CY plus 3 | 5,300 |  |  |
CY plus 4 | 5,000 |  |  |
CY plus 5 | 466,700 |  |  |
Payments of Financing Costs | 1,000 | $ 1,200 | $ 8,500 |
Revolving Credit Facility [Member] |  |  |  |
Revolving credit facility amount | 225,000 |  |  |
Potential increase size of the credit facility by an additional amount | $ 150,000 |  |  |
Line of Credit Facility, Interest Rate at Period End | 12500.00% |  |  |
Aggregate commitments availability | $ 17,500 |  |  |
Aggregate commitments availability, percentage | 10.00% |  |  |
Outstanding letter of credit accrued fees and expenses | $ 23,600 |  |  |
Excess availability reduced by outstanding borrowings, outstanding letters of credit and accrued fees and expenses | $ 113,000 |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 2500.00% |  |  |
Swing Line Loans [Member] |  |  |  |
Revolving credit facility amount | $ 25,000 |  |  |
Letter Of Credit [Member] |  |  |  |
Revolving credit facility amount | 60,000 |  |  |
Secured Debt [Member] |  |  |  |
Deferred Finance Costs, Noncurrent, Gross | $ 8,500 |  |  |
Borrowing rate in addition to LIBOR | 25000.00% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.56% |  |  |
Debt Instrument, Periodic Payment, Principal | $ 1,225 |  |  |
Long-term Debt, Gross | 500,000 |  |  |
Future maturities of outstanding borrowings |  |  |  |
Debt Instrument, Unamortized Discount | 1,500 |  |  |
Financial Liabilities Fair Value Disclosure | $ 490,900 |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Revolving Credit Facility [Member] |  |  |  |
Borrowing rate in addition to LIBOR | 12500.00% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.75% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Revolving Credit Facility [Member] |  |  |  |
Borrowing rate in addition to LIBOR | 15000.00% |  |  |
Base Rate [Member] | Minimum [Member] | Revolving Credit Facility [Member] |  |  |  |
Borrowing rate in addition to LIBOR | 2500.00% |  |  |
Base Rate [Member] | Maximum [Member] | Revolving Credit Facility [Member] |  |  |  |
Borrowing rate in addition to LIBOR | 5000.00% |  |  |
Scenario, Forecast [Member] | Secured Debt [Member] |  |  |  |
Agreement termination date |  |  |  | Nov. 25, 2021

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