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Credit Facility (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 27, 2019
Apr. 28, 2018
Apr. 29, 2017
Line of Credit Facility [Line Items]      
Credit facility at period end $ 203,800 $ 158,700 $ 64,900
Average balance outstanding during the period 215,630 141,478 96,297
Maximum borrowings outstanding during the period $ 335,825 $ 287,933 $ 285,278
Weighted average interest rate during the period [1] 5.29% 5.55% 5.77%
Interest rate at end of period 4.17% 3.92% 3.73%
[1] Includes commitment fees.