Summary of Information Regarding Stock Options (Detail) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 25, 2016 USD ($) $ / shares shares
Number of Options
Beginning Balance, number of options | shares	637,221
Exercised, number of options | shares	(68,606)
Forfeited, number of options | shares	(3,000)
Ending Balance, number of options | shares	565,615
Options exercisable at the ending, Number of Options | shares	468,415
Weighted Average Exercise Price per Share
Beginning Balance, Weighted Average Exercise Price per Share | $ / shares	$ 47.24
Exercised, Weighted Average Exercise Price per Share | $ / shares	45.71
Forfeited, Weighted Average Exercise Price per Share | $ / shares	52.98
Ending Balance, Weighted Average Exercise Price per Share | $ / shares	47.40
Options exercisable at March 26, 2016 | $ / shares	$ 46.02
Weighted Average Remaining Contractual Term (years)
Options outstanding at June 25, 2016	4 years 8 months 12 days
Options exercisable at June 25, 2016	4 years 4 months 24 days
Aggregate Intrinsic Value
Options outstanding at June 25, 2016 | $	$ 10,992
Options exercisable at June 25, 2016 | $	$ 9,749