Divestitures (Narrative) (Details) € in Millions					3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 02, 2020 USD ($)	Nov. 29, 2019	Jan. 28, 2019 USD ($)	Jan. 02, 2019 USD ($)	Jun. 28, 2020 USD ($)	Mar. 29, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 28, 2020 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jan. 02, 2020 EUR (€)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated earnings					$ 217,300,000			$ 217,300,000		$ 223,800,000
Loss on assets held for sale					1,100,000		$ 0	26,800,000	$ 0
Adjustment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated earnings										22,600,000
Out of period error in Income from Discontinued Operations, net of tax
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Out of period error					22,600,000
GBL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax (loss) gain on sale					(200,000)			3,600,000		989,800,000
Transaction costs associated with the divestiture									12,900,000
Indenmifications, acquisition agreement					50,300,000			50,300,000
Write-down of assets of business held for sale to fair value less cost to sell							0
Depreciation and amortization expense							$ 0		0
GBL | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Tax benefit to discontinued operations					8,800,000
GBL | Other Long-Term Liabilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net settlement payable					16,300,000			16,300,000
GAC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs associated with the divestiture									8,800,000
Write-down of assets of business held for sale to fair value less cost to sell									110,000,000.0
Depreciation and amortization expense									$ 1,400,000
GAC | Other Long-Term Liabilities
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Indenmifications, acquisition agreement					1,400,000			1,400,000
Coevorden Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds						$ 30,100,000
Goodwill						10,600,000
Loss on assets held for sale								26,800,000
Coevorden Operations | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Period of lease and operate distribution center		18 months
Energizer | GBL
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price				$ 1,956,200,000
Target sales price				600,000,000
Downward adjustment (not to exceed)				$ 200,000,000
Contingent settlement						$ 197,000,000.0
Energizer | GBL | Indemnification payable
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net settlement payable					$ 34,000,000.0			$ 34,000,000.0
Energizer | GBL | Maximum
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Potential downward adjustment, percentage				75.00%
Potential upward adjustment, percentage				25.00%
Energizer | Varta AG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price | €											€ 180
Transaction costs associated with the divestiture	$ 200,000,000.0
Energizer | GAC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Purchase price			$ 938,700,000
Write-down of assets of business held for sale to fair value less cost to sell										$ 111,000,000.0
Proceeds from sale of stock			$ 242,100,000