Common Stock Repurchases - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchased and cancelled shares	9,500	19,110
Common stock repurchased, value	$ 700,000	$ 1,400,000
Common stock repurchased, average price	$ 69.10	$ 73.34
Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchased and cancelled shares	400,388	1,006,365
Common stock repurchased, value	$ 27,400,000	$ 74,700,000
Common stock repurchased, average price	$ 68.46	$ 74.26
Share repurchase program shares authorized to be repurchased	$ 250,000,000