Deferred Stock Activity (Detail) (Deferred Stock Activity, USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Deferred Stock Activity
Number of Shares
Number of Shares, Balance at beginning of year	231,000	240,000	195,000
Number of shares, Issued	66,000	76,000	96,000
Number of shares, Exercised	(45,000)	(85,000)	(51,000)
Number of shares, Balance at end of year	252,000	231,000	240,000
Outstanding vested at end of year, Number of Shares	160,000	128,000	124,000
Outstanding unvested at end of year, Number of Shares	92,000	103,000	116,000
Shares vesting during the year, Number of Shares	77,000	70,000	71,000
Weighted Average Fair Value
Weighted Average Fair Value, Balance at beginning of year	$ 16.43	$ 15.11	$ 14.60
Weighted Average Fair Value, Initial grant	$ 20.62	$ 19.35	$ 15.41
Weighted Average Grant Date Fair Value, Rights exercised	$ 18.01	$ 15.31	$ 13.71
Weighted Average Fair Value, Balance at end of year	$ 17.24	$ 16.43	$ 15.11
Outstanding vested at end of year, Weighted Average Fair Value	$ 15.98	$ 15.11	$ 15.00
Outstanding unvested at end of year, Weighted Average Fair Value	$ 19.45	$ 18.07	$ 15.23
Shares vesting during the year	$ 18.62	$ 15.73	$ 13.39