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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2018
Fair Value Disclosures [Abstract] |
Financial Assets And Liabilities Measured At Fair Value On Recurring Basis | The following table presents the financial assets and liabilities measured at fair value on a recurring basis (in thousands):
|  | Total |  | Quoted Prices in Active Markets for Identical Assets (3) (Level 1) |  | Significant Other Observable Inputs (3) (Level 2) |  | Significant Unobservable Inputs (3) (Level 3)
Fair value measurements as of September 30, 2018: |  |  |  |  |  |  |  |
Non-qualified deferred compensation plan (1) |  | $ | 37,447 |  |  | $ | 37,447 |  |  | $ | — |  |  | $ | — |
Interest rate swaps (Note 6) (2) |  | 703 |  |  | — |  |  | 703 |  |  | — |
Total assets and liabilities at fair value |  | $ | 38,150 |  |  | $ | 37,447 |  |  | $ | 703 |  |  | $ | — |
Fair value measurements as of October 1, 2017: |  |  |  |  |  |  |  |
Non-qualified deferred compensation plan (1) |  | $ | 37,219 |  |  | $ | 37,219 |  |  | $ | — |  |  | $ | — |
Interest rate swaps (Note 6) (2) |  | 22,927 |  |  | — |  |  | 22,927 |  |  | — |
Total liabilities at fair value |  | $ | 60,146 |  |  | $ | 37,219 |  |  | $ | 22,927 |  |  | $ | — |
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(1) | We maintain an unfunded defined contribution plan for key executives and other members of management. The fair value of this obligation is based on the closing market prices of the participants’ elected investments. The obligation is included in accrued liabilities and other long-term liabilities on our condensed consolidated balance sheets.
(2) | We entered into interest rate swaps to reduce our exposure to rising interest rates on our variable rate debt. The fair values of our interest rate swaps are based upon Level 2 inputs, which include valuation models as reported by our counterparties. These valuation models use a discounted cash flow analysis on the cash flows of each derivative. The key inputs for the valuation models are quoted market prices, discount rates, and forward yield curves. The Company also considers its own nonperformance risk and the respective counter-party’s nonperformance risk in the fair value measurements.
(3) | We did not have any transfers in or out of Level 1, 2, or 3.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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