Shareholders' Equity and Earnings Per Share - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jul. 17, 2012	Oct. 26, 2011	Jul. 28, 2012	Apr. 28, 2012	Jul. 28, 2012	Jul. 28, 2012 Restricted Stock	Jul. 30, 2011 Restricted Stock	Jul. 28, 2012 Restricted Stock	Jul. 30, 2011 Restricted Stock	Jul. 28, 2012 Stock Options	Jul. 30, 2011 Stock Options	Jul. 28, 2012 Stock Options	Jul. 30, 2011 Stock Options
Shareholders Equity and Earnings Per Share [Line Items]
Stock repurchase program, authorized amount	$ 350	$ 300
Stock repurchase program, increase in the existing Repurchase Program	50
Stock repurchase program, remaining available amount					50.1
Stock repurchase program, expired period					January 2014
Shares repurchased			6,425,296		6,425,296
Stock repurchased average price					$ 44.70
Effect of shares excluded from basic weighted average number of shares						4,579,232	585,636	3,108,956	558,911
Anti-dilutive shares excluded from the calculation of earnings per share										287,487	144,183	223,811	311,742
Dividends payable, date of record			Jul. 27, 2012
Dividends payable, amount per share			$ 0.12	$ 0.12	$ 0.12
Accrued expenses and other current liabilities			$ 9.7		$ 9.7
Dividend, paid date			Aug. 28, 2012	May 29, 2012