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Credit Facility (Detail) - USD ($)
$ in Thousands
12 Months Ended
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Line of Credit Facility [Line Items]      
Credit facility at period end $ 0 $ 0 $ 77,000
Average balance outstanding during the period 18,227 48,254 214,702
Maximum borrowings outstanding during the period $ 202,800 $ 180,300 $ 462,900
Weighted average interest rate during the period [1] 38.18% 15.65% 5.56%
Interest rate at end of period 0.00% 0.00% 4.93%
[1] Includes commitment fees.