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Debt (Narrative) (Details) - USD ($)	Apr. 30, 2021	Sep. 30, 2021	Sep. 25, 2020
Debt Instrument [Line Items]
Debtor in possession, borrowings outstanding		$ 0
Amount arranged			$ 500,000,000
Reorganization Adjustments
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 550,000,000
Debt Issuance Costs, Net	(5,200,000)
Senior Notes | First Lien Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 550,000,000
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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