Stock Option Activity (Detail) - Stock Option $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jul. 15, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding at beginning of period | shares	1,846
Options, Exercised | shares	(587)
Options, Outstanding at end of period | shares	1,259
Options, Exercisable at end of period | shares	1,259
Weighted Average Exercise Price, Outstanding at beginning of year | $ / shares	$ 10.89
Weighted Average Exercise Price, Exercised | $ / shares	10.93
Weighted Average Exercise Price, Outstanding at end of period | $ / shares	10.87
Weighted Average Exercise Price, Exercisable at end of period | $ / shares	$ 10.87
Weighted Average Remaining Contractual Term (Years), Outstanding at end of period	6 months 25 days
Weighted Average Remaining Contractual Term (Years), Exercisable at end of period	6 months 25 days
Aggregate Intrinsic Value, Outstanding at end of period | $	$ 8,411
Aggregate Intrinsic Value, Exercisable at end of period | $	$ 8,411