Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Apr. 26, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Other intangibles acquired, fair value	$ 45,800
Weighted average useful life	10 years
Distribution fee	100,000
Distribution agreement period	10 years
Amortization of the distribution agreement fee record period	10 years
Future amortization expense, 2015	25,315,000
Future amortization expense, 2016	26,275,000
Future amortization expense, 2017	28,231,000
Future amortization expense, 2018	13,391,000
Future amortization expense, 2019	$ 4,128,000