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Revenue Recognition - Rollforward of Allowance for Product Returns (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Allowance For Product Returns [Roll Forward] |  |  |
Beginning Balance | $ 19.2 | $ 20.9 | $ 20.3
Charged to Profit & Loss | 36.9 | 33.4 | 30.3
Deductions | (33.3) | (34.4) | (31.8)
Other Adjustments | 0.3 | (0.7) | 2.1
Ending Balance | $ 23.1 | $ 19.2 | $ 20.9

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- 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

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- 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

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- 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

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- 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

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- 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