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Debt (Narrative) (Details) - USD ($) | Apr. 30, 2021 | Jun. 30, 2021 | Sep. 25, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Debtor in possession, borrowings outstanding |  | $ 0 |
Amount arranged |  |  | $ 500,000,000.0
Reorganization Adjustments |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 550,000,000.0 |  |
Debt Issuance Costs, Net | (5,200,000) |  |
Senior Notes | First Lien Notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 550,000,000.0 |  |
Debt Instrument, Percent Secured, Equity Interest | 100.00% |  |
Amount arranged | $ 520,000,000 |  |
Debt Instrument, Allowable Redemption Percent, Prior To Maturity | 35.00% |  |
Debt Instrument, Redemption Price, Percent Of Net Cash Proceeds From Equity Offering | 104.00% |  |
Debt Instrument, Percent Of Note Remaining Outstanding | 65.00% |  |
Debt Instrument, Redemption Period Timing | 12000.00% |  |
Senior Notes | First Lien Notes | Debt Instrument, Redemption, Period One |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Redemption Price, Percent Of Net Cash Proceeds From Equity Offering | 104.00% |  |
Senior Notes | First Lien Notes | Debt Instrument, Redemption, Period Two |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Redemption Price, Percent Of Net Cash Proceeds From Equity Offering | 100.00% |  |
Senior Notes | First Lien Notes | Debt Instrument, Redemption, Period Three |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Redemption Price, Percent Of Net Cash Proceeds From Equity Offering | 101.00% |  |
Senior Notes | First Lien Notes | Debt Instrument, Interest Rate Payout Option One |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Annual Payment Percent | 8.25% |  |
Senior Notes | First Lien Notes | Debt Instrument, Interest Rate Payout Option Two |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Annual Payment Percent | 10.25% |  |
Debt Instrument, Annual Interest Payout Percent In Cash | 50.00% |  |
Debt Instrument, Annual interest Payout Percent Paid In Kind | 50.00% |  |
Senior Notes | First Lien Notes | Debt Instrument, Interest Rate Payout Option Three |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Annual Payment Percent Paid In Kind | 12.00% |  |

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