Stock-Based Compensation Plans - Narrative (Details) $ in Millions	12 Months Ended
Sep. 30, 2023 USD ($) shares
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unexercised SARs lapsing period	10 years
Nonvested Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs \| $	$ 5.6
Unrecognized compensation costs weighted average period related to nonvested awards	1 year 10 months 24 days
Aggregate intrinsic value \| $	$ 45.0
Nonvested Stock Units - Performance Based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Minimum \| Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Minimum \| Nonvested Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Maximum \| Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Maximum \| Nonvested Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Valvoline Inc. Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized \| shares	21,000,000
Number of shares remaining under the plan (in shares) \| shares	10,300,000

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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