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REVENUE RECOGNITION - Rollforward of Allowance for Product Returns (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Allowance For Product Returns [Roll Forward]
Beginning Balance	$ 12.8	$ 9.8	$ 12.1
Charged to Profit & Loss	1.5	6.0	1.7
Deductions	(2.9)	(3.3)	(3.6)
Other Adjustments	0.4	0.3	(0.4)
Ending Balance	$ 11.8	$ 12.8	$ 9.8

X

- Definition

Allowance For Product Returns

+ References

No definition available.

+ Details

Name:	spb_AllowanceForProductReturns
Namespace Prefix:	spb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Allowance For Product Returns Other Adjustments

+ References

No definition available.

+ Details

Name:	spb_AllowanceForProductReturnsOtherAdjustments
Namespace Prefix:	spb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Allowance For Product Returns

+ References

No definition available.

+ Details

Name:	spb_AllowanceForProductReturnsRollForward
Namespace Prefix:	spb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Allowance For Product Returns Write Offs

+ References

No definition available.

+ Details

Name:	spb_AllowanceForProductReturnsWriteOffs
Namespace Prefix:	spb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Provision For Product Returns

+ References

No definition available.

+ Details

Name:	spb_ProvisionForProductReturns
Namespace Prefix:	spb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration