Stock Plans (Restricted Shares Outstanding) (Details) - Restricted Stock [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	4 Months Ended	5 Months Ended
	Apr. 30, 2021	Sep. 30, 2021
2017 EIP [Member] | Predecessor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares)	304	154
Restricted stock granted (in shares)
Restricted stock vested (in shares)	(41)
Restricted stock forfeited (in shares)	(109)
Balance at end of period (in shares)	154
Cancellation of restricted stock (in shares)	(154)
Balance after cancellation at end of period (in shares)
Balance at beginning of period (in dollars per shares)	$ 6.78	$ 5.38
Restricted stock granted (in dollars per shares)
Restricted stock vested (in dollars per shares)	8.23
Restricted stock forfeited (in dollars per shares)	8.23
Balance at end of period (in dollars per shares)	5.38
Cancellation of restricted stock (in dollars per shares)
Balance after cancellation at end of period (in dollars per shares)
Balance at beginning of period
Restricted stock granted
Restricted stock vested
Restricted stock forfeited
Balance at end of period
Cancellation of restricted stock
Balance after cancellation at end of period
2021 Incentive Plan [Member] | Successor [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance at beginning of period (in shares)
Restricted stock granted (in shares)		2,365
Restricted stock vested (in shares)		(9)
Restricted stock forfeited (in shares)		(42)
Balance at end of period (in shares)		2,314
Balance at beginning of period (in dollars per shares)
Restricted stock granted (in dollars per shares)		28.75
Restricted stock vested (in dollars per shares)		28.75
Restricted stock forfeited (in dollars per shares)		28.75
Balance at end of period (in dollars per shares)		$ 28.75
Balance at beginning of period
Restricted stock granted		66
Restricted stock vested
Restricted stock forfeited
Balance at end of period		$ 65