Stock-Based Compensation Expense (Detail)	3 Months Ended				9 Months Ended
	Sep. 30, 2018 USD ($) group $ / shares shares	Apr. 01, 2018 USD ($)	Oct. 01, 2017 USD ($) $ / shares	Apr. 02, 2017 USD ($)	Sep. 30, 2018 USD ($) group $ / shares shares	Oct. 01, 2017 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, performance-based restricted stock, years					1 year
Vesting period, time-based restricted stock, years					3 years
Groups within the employee population | group	2				2
Estimated annual forfeiture rate for unvested options for senior management	8.00%				8.00%
Estimated annual forfeiture rate for unvested options for all other employees	12.00%				12.00%
Increase (decrease) to compensation expense		$ 1,283,000		$ 673,000
Weighted-average grant-date fair values, in dollars per share | $ / shares	$ 22.52		$ 14.80		$ 21.70	$ 14.97
Total intrinsic value	$ 17,985,000		$ 28,462,000		$ 50,975,000	$ 100,913,000
Total fair values of stock options vest	997,000		844,000		27,557,000	19,557,000
Unrecognized compensation expense	50,387,000				$ 50,387,000
Weighted average period to be recognized					1 year 7 months 10 days
Stock-based compensation expense	9,143,000		8,026,000		$ 31,339,000	23,355,000
Tax benefit from compensation expense	1,654,000		$ 2,639,000		5,608,000	$ 7,661,000
Recognized period costs capitalized	$ 0				$ 0
General Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for stock option plans					4 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant under stock option plans | shares	20,246,002				20,246,002
Expiration period from grant day					10 years