Taxes (Tables)
 3 Months Ended
Apr. 01, 2018
Income Tax Disclosure [Abstract]  
Reconciliation of United States Federal Statutory Corporate Tax Rate to Company's Effective Tax Rate, or Income Tax Provision
A reconciliation of the United States federal statutory corporate tax rate to the Company’s income tax expense, or effective tax rate, was as follows:
 
Three-months Ended
 
April 1, 2018
 
April 2, 2017
Income tax provision at federal statutory corporate tax rate
21
 %
 
35
 %
State income taxes, net of federal benefit
1
 %
 
1
 %
Foreign tax rate differential
(7
)%
 
(18
)%
Tax credit
(1
)%
 
(1
)%
Discrete tax benefit related to stock option exercises
(13
)%
 
(33
)%
Other discrete tax events
—
 %
 
(1
)%
Other
1
 %
 
1
 %
Income tax provision
2
 %

(16
)%