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Income Taxes - Significant Components of Deferred Tax Assets (Liabilities) (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 24, 2017
Deferred tax assets:    
Investment writedowns $ 1.1 $ 1.8
Inventory writedowns 11.6 7.4
Property and equipment 1.9 3.0
Accrued compensation 0.1 0.2
Deferred compensation 0.6 1.9
Share-based compensation 11.1 15.6
Business credit carryforward 25.3 19.2
Net operating loss carryforward   0.3
Acquisition intangibles 0.6  
Other accruals 1.6 2.0
Deferred Tax Assets, Gross 53.9 51.4
Valuation allowance (23.3) (15.8)
Deferred Tax Assets, Net 30.6 35.6
Deferred tax liabilities:    
Acquisition intangibles   (9.2)
Interest (14.7) (3.3)
Deferred tax liabilities, Total (14.7) (12.5)
Net deferred tax assets $ 15.9 $ 23.1