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Credit Facility (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Line of Credit Facility [Line Items]      
Credit facility at period end $ 158,700 $ 64,900 $ 47,200
Average balance outstanding during the period 141,478 96,297 66,948
Maximum borrowings outstanding during the period $ 287,933 $ 285,278 $ 293,200
Weighted average interest rate during the period [1] 5.55% 5.77% 8.21%
Interest rate at end of period 3.92% 3.73% 2.69%
[1] Includes commitment fees.