Restricted Stock and Performance-Based Restricted Stock Activity Related to Equity Incentive Plans (Detail)	12 Months Ended
	Jan. 01, 2017 $ / shares shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Restricted Stock, Nonvested Shares at beginning of period | shares	316,332
Restricted Stock, Nonvested Shares granted | shares	97,650	[1]
Restricted Stock, Nonvested Shares cancelled | shares	(13,970)
Restricted Stock, Nonvested Shares vested | shares	(123,792)
Restricted Stock, Nonvested Shares at end of period | shares	276,220
Weighted Average Grant Date Fair Value at beginning of period | $ / shares	$ 75.74
Weighted Average Grant Date Fair Value, granted | $ / shares	131.75	[1]
Weighted Average Grant Date Fair Value, cancelled | $ / shares	88.34
Weighted Average Grant Date Fair Value, vested | $ / shares	70.39
Weighted Average Grant Date Fair Value at end of period | $ / shares	$ 97.48

[1] The weighted average grant date fair value for performance-based restricted shares granted was calculated based on the market price on the grant dates. Certain tranches will ultimately be valued when the performance condition is established for each tranche, which generally occurs in the fourth quarter of each fiscal year.