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Income Taxes, New Tax Legislation and ASU 2016-09 (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 26, 2017
Dec. 31, 2018
Dec. 25, 2018
Dec. 31, 2017
Dec. 26, 2017
Dec. 27, 2016
Income Taxes            
Effective tax rate (as a percent)     12.90%   26.10% 29.80%
Income tax (expense) benefit     $ (24,257)   $ (48,581) $ (51,183)
Federal corporate tax rate (as a percent)   21.00% 21.00% 35.00% 35.00% 35.00%
Income tax (expense) benefit related to share-based compensation         $ 3,400  
Earnings per share basic and diluted, related to new tax legislation, share-based compensation (in dollars per share)         $ 0.05  
Income tax (expense) benefit, net tax legislation, revalue of deferred tax balances and foreign operations $ 3,100       $ 3,100  
Earnings per share basic and diluted, related to new tax legislation, revaluation of deferred tax balances and foreign operations $ 0.04       $ 0.04  
Income tax (expense) benefit, new tax legislation revaluing deferred tax balances         $ 3,800  
Income tax expense, new tax legislation foreign operations         $ 700