Other Accrued Expenses and Current Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Apr. 30, 2019
Other Accrued Expenses and Current Liabilities
Insurance related liabilities	$ 12,922	$ 14,110
Customer rebates payable	10,211	7,944
Sales taxes payable	9,493	10,448
Reserve for sales returns	4,081	4,701
Income taxes payable	2,844	14,063
Real estate and personal property taxes	2,182	2,010
Contingent consideration	2,018	13,073
Other	20,061	13,499
Total other accrued expenses and current liabilities	$ 63,812	$ 79,848