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Income Taxes - Differences Between Income Tax Expense (Benefit) at Federal Income Tax Rate and Effective Income Tax Rate (Detail)
3 Months Ended 12 Months Ended
Apr. 28, 2013
Jan. 27, 2013
Oct. 28, 2012
Jul. 29, 2012
Apr. 29, 2012
Jan. 29, 2012
Oct. 30, 2011
Jul. 31, 2011
Apr. 28, 2013
Apr. 29, 2012
May 01, 2011
Schedule of Effective Tax Rate Reconciliation [Line Items]                      
federal income tax rate                 34.00% 34.00% 34.00%
foreign tax rate differential                 (6.70%) (8.80%) (6.50%)
increase in tax reserves                 4.00% 6.10% 8.80%
undistributed earnings from foreign subsidiaries                 34.60%    
non-deductible stock option expense                     1.00%
USD election for Canadian returns                     (2.10%)
change in valuation allowance                 (58.30%) (26.10%) (42.20%)
other                 2.10% 1.20% (0.30%)
effective income tax rate 36.90% 37.60% (82.40%) 34.40% 37.70% 37.40% (118.40%) 38.60% 9.70% 6.40% (7.30%)