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Credit Facility (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
May 02, 2015
Line of Credit Facility [Line Items]      
Credit facility at period end $ 64,900 $ 47,200  
Average balance outstanding during the period 96,297 66,948 $ 18,227
Maximum borrowings outstanding during the period $ 285,278 $ 293,200 $ 202,800
Weighted average interest rate during the period [1] 5.77% 8.21% 38.18%
Interest rate at end of period 3.73% 2.69% 0.00%
[1] Includes commitment fees.