Taxes (Detail) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2018	Apr. 01, 2018	Apr. 02, 2017	Dec. 31, 2017
Income Tax [Line Items]
Income tax provision at federal statutory corporate tax rate		21.00%	35.00%
Foreign tax rate differential		7.00%	18.00%
Discrete tax benefit related to stock option exercises		13.00%	33.00%
Increase in reserves for income taxes, net of deferred tax benefit		$ 484
Interest and penalties included in reserve		70
Liability for uncertain tax positions		7,986
Reserve for income taxes classified as a noncurrent iability		6,958		$ 6,488
Reserve for income taxes classified an noncurrent deferred tax assets		1,028
Interest and penalties, gross		847
Minimum decrease in income tax expense due to release in reserves		1,100
Maximum decrease in income tax expense due to release in reserves		$ 1,200
Tax years open to examination by Internal Revenue Service		2014 through 2017
Tax years open to examination by various taxing authorities for other entities		2013 through 2017
Accounting Standards Update 2016-16
Income Tax [Line Items]
Cumulative effect on retained earnings	$ 5,961
Foreign tax authority | Ireland
Income Tax [Line Items]
Income tax provision at federal statutory corporate tax rate		12.50%
Foreign tax authority | China
Income Tax [Line Items]
Income tax provision at federal statutory corporate tax rate		25.00%