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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member] Class A [Member]	Common Stock [Member] Class A [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member] Class B [Member]	Common Stock [Member] Class B [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Additional Paid-in Capital [Member] Class A [Member]	Additional Paid-in Capital [Member] Class B [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member] Class A [Member]	Retained Earnings [Member] Class B [Member]	Treasury Stock [Member]	Treasury Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member] Class A [Member]	Treasury Stock [Member] Class B [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Accumulated Other Comprehensive Loss [Member] Class A [Member]	Accumulated Other Comprehensive Loss [Member] Class B [Member]	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Class A [Member]	Class B [Member]
Balance at Apr. 30, 2017	$ 70,086		$ 13,096		$ 387,896				$ 1,715,423				$ (676,077)				$ (507,287)				$ 1,003,137
Restricted Shares Issued under Stock-based Compensation Plans	0		0		(7,646)				(10)				7,968				0				312
Net Proceeds/(Payments) from Exercise of Stock Options and Other	0		0		15,686				0				13,515				0				29,201
Stock-based Compensation Expense	0		0		11,184				0				60				0				11,244
Purchase of Treasury Shares	0		0		0				0				(39,688)				0				(39,688)
Common Stock Dividends	0		0				$ 0	$ 0			$ (61,813)	$ (11,729)			$ 0	$ 0			$ 0	$ 0			$ (61,813)	$ (11,729)
Common Stock Class Conversions	25		(25)		0				0				0				0				0
Comprehensive Income (Loss), Net of Tax	0		0		0				192,186				0				67,707				259,893
Balance at Apr. 30, 2018	70,111		13,071		407,120				1,834,057				(694,222)				(439,580)				1,190,557
Balance (New Revenue Standard [Member]) at Apr. 30, 2018		$ 0		$ 0		$ 0				$ 4,503				$ 0				$ 0				$ 4,503
Restricted Shares Issued under Stock-based Compensation Plans	0		0		(8,544)				3				8,826				0				285
Net Proceeds/(Payments) from Exercise of Stock Options and Other	0		0		4,837				0				(1,086)				0				3,751
Stock-based Compensation Expense	0		0		18,327				0				0				0				18,327
Purchase of Treasury Shares	0		0		0				0				(59,994)				0				(59,994)
Common Stock Dividends	0		0				0	0			(63,684)	(12,068)			0	0			0	0			(63,684)	(12,068)
Common Stock Class Conversions	16		(16)		0				0				0				0				0
Issuance of Warrants Related to Acquisition of a Business			0					565				0				0				0				565
Comprehensive Income (Loss), Net of Tax	0		0		0				168,263				0				(69,158)				99,105
Balance at Apr. 30, 2019	70,127		13,055		422,305				1,931,074				(746,476)				(508,738)				1,181,347
Restricted Shares Issued under Stock-based Compensation Plans	0		0		(10,992)				0				11,347				0				355
Net Proceeds/(Payments) from Exercise of Stock Options and Other	0		0		358				0				(4,152)				0				(3,794)
Stock-based Compensation Expense	0		0		20,009				0				0				0				20,009
Purchase of Treasury Shares	0		0		0				0				(46,589)				0				(46,589)
Common Stock Dividends	0		0				$ 0	$ 0			$ (64,264)	$ (12,394)			$ 0	$ 0			$ 0	$ 0			$ (64,264)	$ (12,394)
Common Stock Class Conversions	39		(39)		0				0				0				0				0
Comprehensive Income (Loss), Net of Tax			0		0				(74,287)				0				(66,759)				(141,046)
Balance at Apr. 30, 2020	$ 70,166		$ 13,016		$ 431,680				$ 1,780,129				$ (785,870)				$ (575,497)				$ 933,624

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

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