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Income Taxes - Reconciliation to Federal Statutory Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Income tax expense (benefit) differences to amount computed by applying federal statutory rate      
Federal income taxes at statutory rate $ 25,492 $ 25,039 $ 8,802
State income taxes, net of federal income tax benefit 1,900 2,236 2,336
Net change in valuation allowance 151 214 (60)
Nondeductible meals & entertainment 822 761 627
338(h)(10) election   (6,936)  
Redeemable noncontrolling interests   1,053 291
Nondeductible transaction costs 2 109 253
Benefit due to Tax Cuts and Jobs Act (6,763)    
Other (721) 178 335
Total provision for income taxes $ 20,883 $ 22,654 $ 12,584