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Income Taxes - Reconciliation to Federal Statutory Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Income tax expense (benefit) differences to amount computed by applying federal statutory rate      
Federal income taxes at statutory rate $ 14,715 $ 25,492 $ 25,039
State income taxes, net of federal income tax benefit 2,440 1,900 2,236
Impact of foreign rate differences 418    
Net change in valuation allowance 664 151 214
Nondeductible meals & entertainment 635 822 761
338(h)(10) election     (6,936)
Redeemable noncontrolling interests     1,053
Nondeductible transaction costs 529 2 109
Net deferred benefit due to Tax Cuts and Jobs Act   (6,763)  
Intercompany interest expense (5,255)    
Other (107) (721) 178
Total provision for income taxes $ 14,039 $ 20,883 $ 22,654