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Segments - Reconciliation of Net Income to Adjusted EBITDA (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Segments    
Net income $ 24,820 $ 8,650
Interest expense 18,277 16,188
Interest income (12) (236)
Provision for income taxes 7,590 2,836
Depreciation expense 12,422 10,610
Amortization expense 16,853 15,712
Stock appreciation expense 60 334
Redeemable noncontrolling interests 662 531
Equity-based compensation 1,395 404
Severance and other permitted costs 554 4,836
Transaction costs (acquisitions and other) 972 4,753
Gain on sale of assets (156) (121)
Effects of fair value adjustments to inventory 151 4,129
Change in fair value of financial instruments   6,019
Debt transaction costs   627
Adjusted EBITDA $ 83,588 $ 75,272