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Taxes - Reconciliation of United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate, or Income Tax Provision (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jul. 01, 2018
Jun. 30, 2019
Jul. 01, 2018
Income Tax Disclosure [Abstract]        
Income tax expense at U.S. federal statutory corporate tax rate 21.00% 21.00% 21.00% 21.00%
State income taxes, net of federal benefit 1.00% 2.00% 1.00% 2.00%
Foreign tax rate differential (7.00%) (7.00%) (7.00%) (7.00%)
Tax credit (1.00%) (1.00%) (1.00%) (1.00%)
Discrete tax benefit related to stock options (2.00%) (1.00%) (4.00%) (5.00%)
Other 2.00% 2.00% 2.00% 1.00%
Income tax expense 14.00% 16.00% 12.00% 11.00%