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Credit Facility (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2016
May 02, 2015
May 03, 2014
Line of Credit Facility [Line Items]      
Credit facility at period end $ 47,200 $ 0  
Average balance outstanding during the period 66,948 18,227 $ 48,254
Maximum borrowings outstanding during the period $ 293,200 $ 202,800 $ 180,300
Weighted average interest rate during the period [1] 8.21% 38.18% 15.65%
Interest rate at end of period 2.69% 0.00% 0.00%
[1] Includes commitment fees.