Summary of Information Regarding Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Number of Options
Beginning Balance, number of options	773,839	1,454,816	1,781,182
Granted, number of options		1,000	152,500
Exercised, number of options	(133,518)	(615,077)	(421,066)
Forfeited, number of options	(3,100)	(66,900)	(57,800)
Ending Balance, number of options	637,221	773,839	1,454,816
Weighted Average Exercise Price per Share
Beginning Balance, Weighted Average Exercise Price per Share	$ 46.92	$ 44.55	$ 42.56
Granted, Weighted Average Exercise Price per Share		58.06	56.40
Exercised, Weighted Average Exercise Price per Share	45.25	41.27	40.52
Forfeited, Weighted Average Exercise Price per Share	52.91	47.51	43.90
Ending Balance, Weighted Average Exercise Price per Share	$ 47.24	$ 46.92	$ 44.55
Options exercisable, Number of Options
Options exercisable at the beginning, Number of Options	379,389	693,516	661,865
Options exercisable at the ending, Number of Options	415,121	379,389	693,516
Options exercisable, Weighted Average Exercise Price per Share
Options exercisable at the beginning, Weighted Average Exercise Price per Share	$ 44.61	$ 42.29	$ 40.64
Options exercisable at the ending, Weighted Average Exercise Price per Share	$ 45.12	$ 44.61	$ 42.29