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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 30, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]        
Income tax benefit, reported $ (43.9) $ 15.3 $ (30.3) $ 22.6
Revaluation of net deferred income tax liability 37.4   37.4  
Stock-based compensation - performance vesting 15.4   15.4  
Impact of rate reduction on first quarter fiscal 2018 income 2.5      
Income tax expense, excluding benefits $ 11.4   $ 22.5  
Income tax benefit, reported (128.30%) 40.10% (43.10%) 39.20%
Revaluation of net deferred income tax liability 109.60%   53.30%  
Stock-based compensation - performance vesting 45.20%   21.90%  
Impact of rate reduction on first quarter fiscal 2018 income 7.40%      
Income tax expense, excluding benefits 33.90%   32.10%