Accounts Receivable - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Receivables [Abstract]
Accounts receivable sold to financial institutions	$ 63	$ 50

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