Segment Geographic and Significant Customer Information - Schedule Of Net Accounts Receivable from Significant Customers (Detail)	Oct. 26, 2012	Apr. 27, 2012	Oct. 28, 2011
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	10.00%	10.00%
Arrow Electronics, Inc.
Segment Reporting Information [Line Items]
Percentage of net accounts receivable	11.00%
Avnet, Inc.
Segment Reporting Information [Line Items]
Percentage of net accounts receivable	11.00%	11.00%