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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 27, 2020 | Dec. 31, 2017 | Jun. 27, 2020 | Jun. 29, 2019 | Jun. 30, 2018 | Jun. 30, 2018 | Jul. 01, 2019 | Jun. 24, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
U.S. federal corporate tax rate | 21.00% | 35.00% | 21.00% | 21.00% |  | 28.17% |  |
Net deferred tax assets | $ 28.7 |  | $ 28.7 | $ 31.1 |  |  |  |
Valuation allowance | 33.3 |  | 33.3 | 30.4 |  |  |  |
Net increase in valuation allowance |  |  | 2.9 |  |  |  |  |
Undistributed earnings of foreign subsidiaries accounted for one-time transition tax | 1.0 |  | 1.0 |  |  |  |  |
Gross unrecognized tax benefits | 20.1 |  | 20.1 | 18.9 | $ 24.8 | $ 24.8 | $ 18.9 | $ 15.2
Gross unrecognized tax benefits decreased during the year |  |  |  | 1.2 |  |  |  |
Unrecognized tax benefit, reduction of effective tax rate if recognized |  |  |  | 12.6 |  |  |  |
Increase (decrease) in interest and penalties accrued related to unrecognized tax benefits |  |  |  |  |  | $ 0.7 |  |
Interest and penalties accrued related to unrecognized tax benefits | 1.9 |  | 1.9 | 1.9 |  |  |  |
Estimated decrease in unrecognized tax benefit in next 12 months | 1.7 |  | 1.7 |  |  |  |  |
Estimated increase in unrecognized tax benefit in next 12 months | 2.3 |  | 2.3 |  |  |  |  |
Federal [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards | 1.5 |  | 1.5 |  |  |  |  |
Tax credit carryforward, amount | 14.0 |  | 14.0 |  |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Net operating loss carryforwards | 46.2 |  | 46.2 |  |  |  |  |
Net operating loss, beginning of expiration period |  |  |  |  | 2021 |  |  |
Tax credit carryforward, amount | 38.5 |  | 38.5 |  |  |  |  |
Other Assets [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Net deferred tax assets | $ 28.7 |  | $ 28.7 | $ 31.1 |  |  |  |

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