Restructuring and Other Charges - Additional Information (Detail)	12 Months Ended
	Apr. 24, 2015	Mar. 31, 2014	May 31, 2013
Restructuring Cost and Reserve [Line Items]
Reduction of global work force		4.00%	7.00%
May 2013 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force, completion date	Apr. 25, 2014
March 2014 Restructuring
Restructuring Cost and Reserve [Line Items]
Reduction of global work force, completion date	Apr. 24, 2015