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Derivatives - Narrative (Details) € in Millions	12 Months Ended
Derivatives - Narrative (Details) € in Millions	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2019 USD ($)	Sep. 20, 2016
4.00% Notes, due October 1, 2026
Derivative [Line Items]
Long-term secured debt	$ 499,100,000		$ 465,000,000.0
Stated interest rate	4.00%	4.00%	4.00%	4.00%
Cash Flow Hedging \| Commodity Swaps
Derivative [Line Items]
Derivative net (loss) gain estimated to be reclassified from AOCI into earnings over the next 12 months	$ 600,000
Cash Flow Hedging \| Foreign Exchange Contract
Derivative [Line Items]
Derivative net (loss) gain estimated to be reclassified from AOCI into earnings over the next 12 months	2,800,000
Derivative, notional amount	273,400,000		$ 235,600,000
Cash Flow Hedging \| Interest Rate Swap
Derivative [Line Items]
Derivative, notional amount			$ 300,000,000.0
Derivative, fixed interest rate			1.76%
Gain on interest rate swap as a reduction to interest expense	3,600,000
Interest rate swaps outstanding	0		$ 0
Fair Value Hedging
Derivative [Line Items]
Posted cash collateral	0		0
Posted standby letters of credit	0		0
Net Investment Hedge
Derivative [Line Items]
Pre-tax loss in earnings	$ 1,200,000
Net Investment Hedge \| 4.00% Notes, due October 1, 2026 \| Spectrum Brands, Inc.
Derivative [Line Items]
Long-term secured debt \| €		€ 425.0
Stated interest rate	4.00%	4.00%
Not Designated as Hedging Instrument \| Foreign Exchange Contract
Derivative [Line Items]
Derivative, notional amount	$ 802,500,000		$ 977,500,000