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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - UNAUDITED - USD ($) $ in Thousands	Common Stock [Member] Class A [Member]	Common Stock [Member] Class B [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Class A [Member]	Additional Paid-in Capital [Member] Class B [Member]	Retained Earnings [Member]	Retained Earnings [Member] Class A [Member]	Retained Earnings [Member] Class B [Member]	Accumulated Other Comprehensive Loss, Net of Tax [Member]	Accumulated Other Comprehensive Loss, Net of Tax [Member] Class A [Member]	Accumulated Other Comprehensive Loss, Net of Tax [Member] Class B [Member]	Treasury Stock [Member]	Treasury Stock [Member] Class A [Member]	Treasury Stock [Member] Class B [Member]	Total	Class A [Member]	Class B [Member]	Cumulative Effect of Change in Accounting Principle, Net of Tax [Member] Common Stock [Member] Class A [Member]	Cumulative Effect of Change in Accounting Principle, Net of Tax [Member] Common Stock [Member] Class B [Member]	Cumulative Effect of Change in Accounting Principle, Net of Tax [Member] Additional Paid-in Capital [Member]	Cumulative Effect of Change in Accounting Principle, Net of Tax [Member] Retained Earnings [Member]	Cumulative Effect of Change in Accounting Principle, Net of Tax [Member] Accumulated Other Comprehensive Loss, Net of Tax [Member]	Cumulative Effect of Change in Accounting Principle, Net of Tax [Member] Treasury Stock [Member]	Cumulative Effect of Change in Accounting Principle, Net of Tax [Member]
Balance at Apr. 30, 2020	$ 70,166	$ 13,016	$ 431,680			$ 1,780,129			$ (575,497)			$ (785,870)			$ 933,624			$ 0	$ 0	$ 0	$ (1,390)	$ 0	$ 0	$ (1,390)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted shares issued under stock-based compensation plans	0	0	(5,264)			0			0			5,382			118
Impact of tax withholding on stock-based compensation and other	0	0	369			0			0			(1,715)			(1,346)
Stock-based compensation expense	0	0	9,066			0			0			0			9,066
Common stock dividends	0	0		$ 0	$ 0		$ (32,257)	$ (6,223)		$ 0	$ 0		$ 0	$ 0		$ (32,257)	$ (6,223)
Common stock class conversions	13	(13)	0			0			0			0			0
Comprehensive income, net of tax	0	0	0			84,766			33,855			0			118,621
Balance at Oct. 31, 2020	70,179	13,003	435,851			1,825,025			(541,642)			(782,203)			1,020,213			70,179	13,003	435,851	1,825,025	(541,642)	(782,203)	1,020,213
Balance at Jul. 31, 2020	70,177	13,005	431,241			1,775,813			(534,118)			(782,373)			973,745
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted shares issued under stock-based compensation plans	0	0	(143)			(1)			0			198			54
Impact of tax withholding on stock-based compensation and other	0	0	1			0			0			(28)			(27)
Stock-based compensation expense	0	0	4,752			0			0			0			4,752
Common stock dividends	0	0		0	0		(16,108)	(3,111)		0	0		0	0		(16,108)	(3,111)
Common stock class conversions	2	(2)	0			0			0			0			0
Comprehensive income, net of tax	0	0	0			68,432			(7,524)			0			60,908
Balance at Oct. 31, 2020	70,179	13,003	435,851			1,825,025			(541,642)			(782,203)			1,020,213			$ 70,179	$ 13,003	$ 435,851	$ 1,825,025	$ (541,642)	$ (782,203)	$ 1,020,213
Balance at Apr. 30, 2021	70,208	12,974	444,358			1,850,058			(490,790)			(795,517)			1,091,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted shares issued under stock-based compensation plans	0	0	(6,976)			(1)			0			7,114			137
Impact of tax withholding on stock-based compensation and other	0	0	349			0			0			(5,581)			(5,232)
Stock-based compensation expense	0	0	14,077			0			0			0			14,077
Purchase of treasury shares	0	0	0			0			0			(17,367)			(17,367)
Common stock dividends	0	0		0	0		(32,375)	(6,244)		0	0		0	0		(32,375)	(6,244)
Common stock class conversions	3	(3)			0			0			0			0			0
Comprehensive income, net of tax	0	0	0			69,797			(7,419)			0			62,378
Balance at Oct. 31, 2021	70,211	12,971	451,808			1,881,235			(498,209)			(811,351)			1,106,665
Balance at Jul. 31, 2021	70,211	12,971	445,690			1,844,578			(494,600)			(800,945)			1,077,905
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted shares issued under stock-based compensation plans	0	0	(634)			2			0			705			73
Impact of tax withholding on stock-based compensation and other	0	0	39			0			0			(1,111)			(1,072)
Stock-based compensation expense	0	0	6,713			0			0			0			6,713
Purchase of treasury shares	0	0	0			0			0			(10,000)			(10,000)
Common stock dividends	0	0		$ 0	$ 0		$ (16,190)	$ (3,122)		$ 0	$ 0		$ 0	$ 0		$ (16,190)	$ (3,122)
Comprehensive income, net of tax	0	0	0			55,967			(3,609)			0			52,358
Balance at Oct. 31, 2021	$ 70,211	$ 12,971	$ 451,808			$ 1,881,235			$ (498,209)			$ (811,351)			$ 1,106,665

X

- Definition

Amount of increase (decrease) in additional paid in capital (APIC) resulting from a tax benefit (deficiency) associated with an share-based compensation plan other than an employee stock ownership plan (ESOP).

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Value, after forfeiture, of shares granted under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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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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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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