Share Repurchase Program (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended	2 Months Ended
	Dec. 25, 2011	Feb. 14, 2012 Subsequent Event [Member]
Accelerated Share Repurchases [Line Items]
Stock repurchase program, authorized amount	$ 925.0
Stock repurchase program, expiration date	Dec. 31, 2012
Stock repurchase program, remaining authorized amount	71.5	69.3
Stock repurchased during period, shares		60,000
Stock repurchased during period, value		$ 2.2