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Long-Term Incentive Awards (Details) - USD ($)	3 Months Ended				12 Months Ended
Long-Term Incentive Awards (Details) - USD ($)	Jul. 31, 2020	Jul. 27, 2019	Jul. 28, 2018	Apr. 30, 2017	Apr. 30, 2020	Apr. 25, 2020	Apr. 30, 2019	Apr. 30, 2018
Stock Based Compensation
Stock based compensation expense					$ 6,227,000		$ 6,985,000	$ 4,956,000
Performance based restricted stock units \| 100% Vested
Stock Based Compensation
Vesting (as a percentage)					100.00%
Performance based restricted stock units \| 50% Vested
Stock Based Compensation
Vesting (as a percentage)					50.00%
Performance based restricted stock units \| 200% Vested
Stock Based Compensation
Vesting (as a percentage)					200.00%
Performance based restricted stock units \| Maximum
Stock Based Compensation
Stock based compensation expense					$ 4,263,000
LTIP
Stock Based Compensation
Stock based compensation expense					2,657,000		1,889,000
Fiscal 2020 LTIP
Stock Based Compensation
Stock based compensation expense					649,000
Fiscal 2019 LTIP \| Performance based restricted stock units
Stock Based Compensation
Stock based compensation expense					386,000		572,000
Fiscal 2019 LTIP \| Performance based restricted stock units \| 100% Vested
Stock Based Compensation
Vesting (as a percentage)			100.00%
Fiscal 2019 LTIP \| Performance based restricted stock units \| 50% Vested
Stock Based Compensation
Vesting (as a percentage)			50.00%
Fiscal 2019 LTIP \| Performance based restricted stock units \| 200% Vested
Stock Based Compensation
Vesting (as a percentage)			200.00%
Fiscal 2019 LTIP \| Performance based restricted stock units \| Maximum
Stock Based Compensation
Stock based compensation expense					2,478,000
Fiscal 2018 LTIP
Stock Based Compensation
Issue of fully-vested shares of common stock to settle		14,814
Fiscal 2018 LTIP \| Performance based restricted stock units
Stock Based Compensation
Stock based compensation expense					$ 193,000		588,000	$ 269,000
Issue of fully-vested shares of common stock to settle	27,356
Fiscal 2018 LTIP \| Performance based restricted stock units \| 100% Vested
Stock Based Compensation
Vesting (as a percentage)				100.00%
Fiscal 2018 LTIP \| Performance based restricted stock units \| 50% Vested
Stock Based Compensation
Vesting (as a percentage)				50.00%
Fiscal 2018 LTIP \| Performance based restricted stock units \| 200% Vested
Stock Based Compensation
Vesting (as a percentage)				200.00%
Fiscal 2017 LTIP
Stock Based Compensation
Stock based compensation expense						$ 0	$ 0