Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Accumulated other comprehensive (loss) income [Roll Forward]
Balance	$ 633,981	$ 629,176	$ 579,451
Other comprehensive income (loss) before reclassification	61,030	(40,520)	(27,743)
Reclassification to earnings from accumulated other comprehensive income (loss)	8,811	2,012	728
Balance	822,462	633,981	629,176
Other comprehensive loss on derivative instruments before reclassification, tax	100	6,400	1,400
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive (loss) income [Roll Forward]
Balance	(65,082)	(26,574)	441
Balance	4,759	(65,082)	(26,574)
Foreign Currency Translation
Accumulated other comprehensive (loss) income [Roll Forward]
Balance	(40,577)	(22,320)	0
Other comprehensive income (loss) before reclassification	61,341	(18,257)	(22,320)
Reclassification to earnings from accumulated other comprehensive income (loss)	0	0	0
Balance	20,764	(40,577)	(22,320)
Derivative Financial Instruments
Accumulated other comprehensive (loss) income [Roll Forward]
Balance	(24,505)	(4,254)	441
Other comprehensive income (loss) before reclassification	(311)	(22,263)	(5,423)
Reclassification to earnings from accumulated other comprehensive income (loss)	8,811	2,012	728
Balance	$ (16,005)	$ (24,505)	$ (4,254)

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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