Related Party Transactions (Details) - USD ($) $ in Millions	7 Months Ended	12 Months Ended
Sep. 14, 2018	Jan. 31, 2018
Former parent
Allocations for general corporate expenses, including management costs and corporate support services	$ 16.6	$ 18.7

Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

No definition available.

Name:	us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration