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Debt - Redemption of 5.625% Senior Secured Notes (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 05, 2018 | Oct. 09, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Apr. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 0 | $ 4,000 | $ 0 | $ 7,000 |
5.625% Senior Secured Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate |  |  | 5.625% | 5.625% | 5.625% | 5.625% |
5.625% Senior Secured Notes | Acquisition Corp. |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate | 5.625% | 5.625% |  |  |  |  | 5.625%
Redemptions of senior notes | $ 26,550 | $ 26,550 |  |  |  |  |
Senior notes redemption price | $ 27,380 |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed | 102.813% |  |  |  |  |  |
Debt instrument remaining outstanding amount | $ 220,950 |  |  |  |  |  |
Loss on extinguishment of debt | $ 1,000 |  |  | $ 4,000 |  | $ 4,000 |

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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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