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Income Taxes - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Income Taxes [Line Items]
Loss carryforwards		$ 30,400,000	$ 30,800,000
U.S. statutory rate		21.00%	21.00%	35.00%
Income tax expense (benefit)		$ 400,000	$ (27,100,000)	$ 12,800,000
Income tax benefit from tax-exempt income on life insurance policies		(6,500,000)
Valuation allowance		19,000,000.0	27,800,000
Deferred tax asset revaluation, income tax expense				13,900,000
Provisional income tax expense				0
Actual transition tax	$ 0
Undistributed earnings of foreign subsidiaries		135,300,000
Unrecognized tax benefits		900,000	1,100,000	1,200,000	$ 1,400,000
Unrecognized tax benefits that would impact effective tax rate		800,000	900,000	$ 1,000,000.0
Unrecognized tax benefits, income tax penalties and interest accrued		200,000	200,000
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit		500,000
General Business Tax Credit Carryforward
Income Taxes [Line Items]
General business credit carryforward		160,900,000
Foreign Tax Credit Carryforward
Income Taxes [Line Items]
General business credit carryforward		6,000,000.0
State Credit Carryforward
Income Taxes [Line Items]
General business credit carryforward		200,000
Pro Forma
Income Taxes [Line Items]
Potential repatriation of foreign earnings amount		9,100,000
Germany
Income Taxes [Line Items]
Valuation allowance		3,900,000
United Kingdom
Income Taxes [Line Items]
Income tax expense (benefit)		(14,300,000)
Persol Holdings Investment
Income Taxes [Line Items]
Income tax expense (benefit)		$ 11,000,000.0	$ (29,400,000)

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