Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Apr. 28, 2012 Year
Goodwill And Other Intangible Assets [Line Items]
Other intangibles acquired, fair value	$ 2,600,000
Weighted average useful life (in years)	10
Distribution fee	100,000,000
Distribution agreement period (in years)	10 years
Amortization of the distribution agreement fee record period (in years)	10 years
Future amortization expense, 2013	19,915,000
Future amortization expense, 2014	21,416,000
Future amortization expense, 2015	22,647,000
Future amortization expense, 2016	24,449,000
Future amortization expense, 2017	$ 27,028,000