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Share Repurchase (Details) - USD ($)
3 Months Ended 6 Months Ended
Oct. 26, 2019
Oct. 27, 2018
Oct. 26, 2019
Oct. 27, 2018
Jul. 27, 2019
Apr. 30, 2019
Sep. 30, 2015
Share Repurchase              
Stock Repurchase Program, Authorized Amount             $ 25,000,000
Shares repurchased and retired 0 0 0 0      
Share authorized for future repurchases         $ 21,200,000 $ 21,200,000