Supplemental Financial Information - Narrative (Details) - USD ($)	6 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Supplemental Financial Information [Abstract]
Accounts receivable sold to financial institutions	$ 59,000,000	$ 63,000,000

Utilization Of Accounts Receivable, Factoring Under Arrangement

No definition available.

Name:	vvv_UtilizationOfAccountsReceivableFactoringUnderArrangement
Namespace Prefix:	vvv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration