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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]	Treasury Stock [Member]	Treasury Stock [Member] Class A [Member]	Treasury Stock [Member] Class B [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member] Class A [Member]	Accumulated Other Comprehensive Loss [Member] Class B [Member]	Total	Class A [Member]	Class B [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment Due to Adoption of New Revenue Standard	$ 0	$ 0	$ 0			$ 4,503			$ 0			$ 0			$ 4,503
Balance at Apr. 30, 2018	70,111	13,071	407,120			1,834,057			(694,222)			(439,580)			1,190,557
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Shares Issued under Stock-based Compensation Plans	0	0	(3,911)			2			4,083			0			174
Net (Payments) Proceeds from Exercise of Stock Options and Other	0	0	4,718			0			1,560			0			6,278
Stock-based Compensation Expense	0	0	14,974			0			0			0			14,974
Purchase of Treasury Shares	0	0	0			0			(34,994)			0			(34,994)
Common Stock Dividends	0	0		$ 0	$ 0		$ (47,911)	$ (9,052)		$ 0	$ 0		$ 0	$ 0		$ (47,911)	$ (9,052)
Common Stock Class Conversions	14	(14)	0			0			0			0			0
Issuance of Warrants Related to Acquisition of a Business	0	0	565			0			0			0			565
Comprehensive (Loss) Income, Net of Tax	0	0	0			105,021			0			(34,686)			70,335
Balance at Jan. 31, 2019	70,125	13,057	423,466			1,886,620			(723,573)			(474,266)			1,195,429
Balance at Oct. 31, 2018	70,125	13,057	417,718			1,870,609			(713,553)			(488,564)			1,169,392
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Shares Issued under Stock-based Compensation Plans	0	0	(927)			0			1,004			0			77
Net (Payments) Proceeds from Exercise of Stock Options and Other	0	0	18			0			(1,024)			0			(1,006)
Stock-based Compensation Expense	0	0	6,092			0			0			0			6,092
Purchase of Treasury Shares	0	0	0			0			(10,000)			0			(10,000)
Common Stock Dividends	0	0		0	0		(15,915)	(3,016)		0	0		0	0		(15,915)	(3,016)
Issuance of Warrants Related to Acquisition of a Business	0	0	565			0			0			0			565
Comprehensive (Loss) Income, Net of Tax	0	0	0			34,942			0			14,298			49,240
Balance at Jan. 31, 2019	70,125	13,057	423,466			1,886,620			(723,573)			(474,266)			1,195,429
Balance at Apr. 30, 2019	70,127	13,055	422,305			1,931,074			(746,476)			(508,738)			1,181,347
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Shares Issued under Stock-based Compensation Plans	0	0	(5,304)			0			5,603			0			299
Net (Payments) Proceeds from Exercise of Stock Options and Other	0	0	355			0			(1,951)			0			(1,596)
Stock-based Compensation Expense	0	0	15,662			0			0			0			15,662
Purchase of Treasury Shares	0	0	0			0			(35,000)			0			(35,000)
Common Stock Dividends	0	0		0	0		(48,331)	(9,301)		0	0		0	0		(48,331)	(9,301)
Common Stock Class Conversions	29	(29)	0			0			0			0			0
Comprehensive (Loss) Income, Net of Tax	0	0	0			83,757			0			10,398			94,155
Balance at Jan. 31, 2020	70,156	13,026	433,018			1,957,199			(777,824)			(498,340)			1,197,235
Balance at Oct. 31, 2019	70,149	13,033	429,968			1,940,902			(770,030)			(505,026)			1,178,996
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Shares Issued under Stock-based Compensation Plans	0	0	(2,512)			0			2,597			0			85
Net (Payments) Proceeds from Exercise of Stock Options and Other	0	0	189			0			(391)			0			(202)
Stock-based Compensation Expense	0	0	5,373			0			0			0			5,373
Purchase of Treasury Shares	0	0	0			0			(10,000)			0			(10,000)
Common Stock Dividends	0	0		$ 0	$ 0		$ (16,049)	$ (3,097)		$ 0	$ 0		$ 0	$ 0		$ (16,049)	$ (3,097)
Common Stock Class Conversions	7	(7)	0			0			0			0			0
Comprehensive (Loss) Income, Net of Tax	0	0	0			35,443			0			6,686			42,129
Balance at Jan. 31, 2020	$ 70,156	$ 13,026	$ 433,018			$ 1,957,199			$ (777,824)			$ (498,340)			$ 1,197,235

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Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants.

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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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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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