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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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