Long-Term Debt - Additional Information (Detail) (USD $)	12 Months Ended					1 Months Ended	12 Months Ended					1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended		1 Months Ended		12 Months Ended		1 Months Ended		12 Months Ended		1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended
	Apr. 28, 2012	Dec. 31, 2011	Mar. 31, 2008	Apr. 28, 2012 Minimum	Apr. 28, 2012 Maximum	Mar. 31, 2008 Interest Rate Swap	Apr. 28, 2012 Interest Rate Swap	Apr. 30, 2011 Interest Rate Swap	Apr. 24, 2010 Interest Rate Swap	Dec. 31, 2011 Fixed-Rate Senior Notes	Mar. 31, 2008 Fixed-Rate Senior Notes	Mar. 31, 2008 Senior Notes 4.63%	Apr. 28, 2012 Senior Notes 4.63%	Apr. 30, 2011 Senior Notes 4.63%	Mar. 31, 2008 Senior Notes 5.17%	Apr. 28, 2012 Senior Notes 5.17%	Apr. 30, 2011 Senior Notes 5.17%	Mar. 31, 2008 Senior Notes 5.17% Interest Rate Swap	Mar. 31, 2008 Senior Notes 5.75%	Apr. 28, 2012 Senior Notes 5.75%	Apr. 30, 2011 Senior Notes 5.75%	Mar. 31, 2008 Senior Notes 5.75% Interest Rate Swap	Dec. 31, 2011 Senior Notes 2.95%	Apr. 28, 2012 Senior Notes 2.95%	Apr. 30, 2011 Senior Notes 2.95%	Dec. 31, 2011 Senior Notes 3.59%	Apr. 28, 2012 Senior Notes 3.59%	Apr. 30, 2011 Senior Notes 3.59%	Dec. 31, 2011 Senior Notes 3.74%	Apr. 28, 2012 Senior Notes 3.74%	Apr. 30, 2011 Senior Notes 3.74%	Mar. 31, 2008 Term Note Due Fiscal 2013	Apr. 28, 2012 Term Note Due Fiscal 2013	Apr. 30, 2011 Term Note Due Fiscal 2013	Mar. 31, 2008 Term Note Due Fiscal 2013 Minimum	Mar. 31, 2008 Term Note Due Fiscal 2013 Maximum
Line of Credit Facility [Line Items]
Expected future minimum principal payments in fiscal year 2013	$ 125,000,000
Expected future minimum principal payments in fiscal year 2015	250,000,000
Expected future minimum principal payments in years thereafter	475,000,000
Aggregate principal amount										325,000,000	450,000,000	50,000,000	50,000,000	50,000,000	250,000,000	250,000,000	250,000,000		150,000,000	150,000,000	150,000,000		60,000,000	60,000,000	0	165,000,000	165,000,000	0	100,000,000	100,000,000	0
Senior notes interest rate												4.63%	4.63%	4.63%	5.17%	5.17%	5.17%	5.17%	5.75%	5.75%	5.75%	5.75%	2.95%	2.95%		3.59%	3.59%		3.74%	3.74%
Senior notes maturity date												2013	2013	2013	2015	2015	2015	2015	2018	2018	2018	2018	2018	2018		2021	2021		2023	2023		2013	2013	2013
Aggregate principal amount																																75,000,000	75,000,000	75,000,000
Interest floating rate based on LIBOR				1.125%	1.875%																														0.50%	1.25%
Weighted average interest rate																																	1.20%	1.11%
Debt issuance costs		1,800,000	1,800,000
Notional amounts of interest rate swap agreements						100,000,000
Increase in net of income taxes, to other comprehensive income						1,000,000
Pre-tax amount reclassified into earnings							200,000	200,000	200,000
Amount expected to be reclassified into earnings							200,000
Number of agreements						2
Available revolving credit facility	$ 300,000,000
Expiration date	December 2016