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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	(2,984)			3			3,080			0			99
Net (Payments) Proceeds from Exercise of Stock Options and Other	0	0	4,700			0			2,583			0			7,283
Stock-based Compensation Expense	0	0	8,882			0			0			0			8,882
Purchase of Treasury Shares	0	0	0			0			(24,994)			0			(24,994)
Common Stock Dividends	0	0		$ 0	$ 0		$ (31,996)	$ (6,037)		$ 0	$ 0		$ 0	$ 0		$ (31,996)	$ (6,037)
Common Stock Class Conversions	14	(14)	0			0			0			0			0
Comprehensive (Loss) Income, Net of Tax	0	0	0			70,079			0			(48,984)			21,095
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]
Adjustment Due to Adoption of New Revenue Standard	0	0	0			0			0			0			0
Balance at Jul. 31, 2018	70,115	13,067	413,488			1,845,811			(696,727)			(471,746)			1,174,008
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Shares Issued under Stock-based Compensation Plans	0	0	(828)			4			877			0			53
Net (Payments) Proceeds from Exercise of Stock Options and Other	0	0	106			0			(703)			0			(597)
Stock-based Compensation Expense	0	0	4,952			0			0			0			4,952
Purchase of Treasury Shares	0	0	0			0			(17,000)			0			(17,000)
Common Stock Dividends	0	0		0	0		(15,974)	(3,016)		0	0		0	0		(15,974)	(3,016)
Common Stock Class Conversions	10	(10)	0			0			0			0			0
Comprehensive (Loss) Income, Net of Tax	0	0	0			43,784			0			(16,818)			26,966
Balance at Oct. 31, 2018	70,125	13,057	417,718			1,870,609			(713,553)			(488,564)			1,169,392
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	(2,793)			0			3,006			0			213
Net (Payments) Proceeds from Exercise of Stock Options and Other	0	0	167			0			(1,560)			0			(1,393)
Stock-based Compensation Expense	0	0	10,289			0			0			0			10,289
Purchase of Treasury Shares	0	0	0			0			(25,000)			0			(25,000)
Common Stock Dividends	0	0		0	0		(32,278)	(6,208)		0	0		0	0		(32,278)	(6,208)
Common Stock Class Conversions	22	(22)	0			0			0			0			0
Comprehensive (Loss) Income, Net of Tax	0	0	0			48,314			0			3,712			52,026
Balance at Oct. 31, 2019	70,149	13,033	429,968			1,940,902			(770,030)			(505,026)			1,178,996
Balance at Jul. 31, 2019	70,139	13,043	424,904			1,915,445			(755,501)			(536,024)			1,132,006
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Shares Issued under Stock-based Compensation Plans	0	0	(681)			1			787			0			107
Net (Payments) Proceeds from Exercise of Stock Options and Other	0	0	60			0			(316)			0			(256)
Stock-based Compensation Expense	0	0	5,685			0			0			0			5,685
Purchase of Treasury Shares	0	0	0			0			(15,000)			0			(15,000)
Common Stock Dividends	0	0		$ 0	$ 0		$ (16,130)	$ (3,104)		$ 0	$ 0		$ 0	$ 0		$ (16,130)	$ (3,104)
Common Stock Class Conversions	10	(10)	0			0			0			0			0
Comprehensive (Loss) Income, Net of Tax	0	0	0			44,690			0			30,998			75,688
Balance at Oct. 31, 2019	$ 70,149	$ 13,033	$ 429,968			$ 1,940,902			$ (770,030)			$ (505,026)			$ 1,178,996

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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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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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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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