Summary of Information Regarding Stock Options (Detail) (USD $)	12 Months Ended
	Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Number of Options
Beginning Balance, number of options	1,454,816	1,781,182	2,326,776
Granted, number of options	1,000	152,500	329,500
Exercised, number of options	(615,077)	(421,066)	(846,294)
Forfeited, number of options	(66,900)	(57,800)	(28,800)
Ending Balance, number of options	773,839	1,454,816	1,781,182
Weighted Average Exercise Price per Share
Beginning Balance, Weighted Average Exercise Price per Share	$ 44.55	$ 42.56	$ 40.11
Granted, Weighted Average Exercise Price per Share	$ 58.06	$ 56.40	$ 52.03
Exercised, Weighted Average Exercise Price per Share	$ 41.27	$ 40.52	$ 39.47
Forfeited, Weighted Average Exercise Price per Share	$ 47.51	$ 43.90	$ 43.23
Ending Balance, Weighted Average Exercise Price per Share	$ 46.92	$ 44.55	$ 42.56
Options exercisable, Number of Options
Options exercisable at the beginning, Number of Options	693,516	661,865	1,110,743
Options exercisable at the ending, Number of Options	379,389	693,516	661,865
Options exercisable, Weighted Average Exercise Price per Share
Options exercisable at the beginning, Weighted Average Exercise Price per Share	$ 42.29	$ 40.64	$ 39.74
Options exercisable at the ending, Weighted Average Exercise Price per Share	$ 44.61	$ 42.29	$ 40.64