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Income Taxes - Provision for Income Taxes Differs from Federal Statutory Rate (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 24, 2017 | Jun. 25, 2016
Income Tax Disclosure [Abstract] |  |  |
Provision at U.S. federal statutory rate | $ (22.9) | $ 21.5 | $ 26.6
Qualified stock options | 4.9 | 5.5 | 5.1
Shortfall related to share-based compensation | 4.1 |  |
Business credits | (4.9) | (3.6) | (10.3)
Foreign tax differential | 16.5 | (13.2) | (22.4)
Non-deductible portion of contingent consideration |  | 0.9 | 0.9
Change in valuation allowance |  | (0.8) | (1.4)
Nondeductible amortization | 1.2 | 1.6 | 4.4
Taxes associated with one-time transition tax | 44.1 |  |
Impact of corporate tax rate change on deferred taxes | (2.7) |  |
Other differences | 0.2 | 0.3 | 0.5
Provision for income taxes | $ 40.5 | $ 12.2 | $ 3.4

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