Consolidated Statements Of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss		Retained Earnings	Treasury Stock
Beginning Balances (in shares) at Apr. 30, 2019			238,337					36,377
Beginning Balances, Value at Apr. 30, 2019		$ 541,527	$ 2,383	$ 767,636	$ (20,416)	[1]	$ 499,386	$ (707,462)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(7,526)					(7,526)
Other comprehensive income (loss)		(31,160)			(31,160)	[1]
Stock-based compensation		27,848		27,848
Stock-based awards exercised or vested (in shares)								969
Stock-based awards exercised or vested		1,436		(14,019)			(3,419)	$ 18,874
Acquisition of treasury shares (in shares)	[2]							(323)
Acquisition of treasury shares(2)	[2]	(9,429)						$ (9,429)
Repurchase and retirement of common shares (in shares)			(10,130)
Repurchase and retirement of common shares		(246,785)	$ (101)	(6,078)			(240,606)
Cash dividends declared		(204,870)					(204,870)
Ending Balances (in shares) at Apr. 30, 2020			228,207					35,731
Ending Balances, Value at Apr. 30, 2020		71,041	$ 2,282	775,387	(51,576)	[1]	42,965	$ (698,017)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		583,791					583,791
Other comprehensive income (loss)		56,362			56,362	[1]
Stock-based compensation		26,138		26,138
Stock-based awards exercised or vested (in shares)								755
Stock-based awards exercised or vested		1,431		(11,417)			(1,900)	$ 14,748
Acquisition of treasury shares (in shares)	[2]							(214)
Acquisition of treasury shares(2)	[2]	(3,081)						$ (3,081)
Repurchase and retirement of common shares (in shares)			(11,551)
Repurchase and retirement of common shares		(188,213)	$ (115)	(6,816)			(181,282)
Cash dividends declared		(195,068)					(195,068)
Ending Balances (in shares) at Apr. 30, 2021			216,656					35,190
Ending Balances, Value at Apr. 30, 2021		352,401	$ 2,167	783,292	4,786	[1]	248,506	$ (686,350)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		89,610					89,610
Other comprehensive income (loss)		(4,698)			(4,698)	[1]
Stock-based compensation		4,285		4,285
Stock-based awards exercised or vested (in shares)								545
Stock-based awards exercised or vested		91		(8,112)			(2,424)	$ 10,627
Acquisition of treasury shares (in shares)	[2]							(197)
Acquisition of treasury shares(2)	[2]	(4,633)						$ (4,633)
Cash dividends declared		(48,998)					(48,998)
Ending Balances (in shares) at Jun. 30, 2021			216,656					34,842
Ending Balances, Value at Jun. 30, 2021		388,058	$ 2,167	779,465	88	[1]	286,694	$ (680,356)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		553,674					553,674
Other comprehensive income (loss)		(21,733)			(21,733)
Stock-based compensation		28,189		28,189
Stock-based awards exercised or vested (in shares)								1,634
Stock-based awards exercised or vested		7,189		(21,622)			(3,126)	$ 31,937
Acquisition of treasury shares (in shares)								(433)
Acquisition of treasury shares(2)		(12,828)						$ (12,828)
Repurchase and retirement of common shares (in shares)			(23,085)
Repurchase and retirement of common shares		(550,346)	$ (231)	(13,850)			(536,265)
Cash dividends declared		(180,572)					(180,572)
Ending Balances (in shares) at Jun. 30, 2022			193,571					33,641
Ending Balances, Value at Jun. 30, 2022		$ 211,631	$ 1,936	$ 772,182	$ (21,645)		$ 120,405	$ (661,247)

[1] The balance of our accumulated other comprehensive income (loss) consists of foreign currency translation adjustments.

[2] Represents shares swapped or surrendered to us in connection with the vesting or exercise of stock-based awards.