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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - 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]
Balance at Apr. 30, 2016	$ 69,798	$ 13,392	$ 368,698			$ 1,673,325			$ (640,421)			$ (447,686)			$ 1,037,106
Restricted Shares Issued under Stock-based Compensation Plans	0	0	(7,617)			0			8,013			0			396
Net (Payments)/Proceeds from Exercise of Stock Options and Other	0	0	8,849			0			6,657			0			15,506
Excess Tax Benefits from Stock-based Compensation	0	0	414			0			0			0			414
Stock-based Compensation Expense	0	0	17,552			0			0			0			17,552
Purchase of Treasury Shares	0	0	0			0			(50,326)			0			(50,326)
Common Stock Dividends	0	0		$ 0	$ 0		$ (60,143)	$ (11,402)		$ 0	$ 0		$ 0	$ 0		$ (60,143)	$ (11,402)
Common Stock Class Conversions	288	(296)	0			0			0			0			(8)
Comprehensive Income (Loss), Net of Tax	0	0	0			113,643			0			(59,601)			54,042
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 (Payments)/Proceeds 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
Adjustment due to adoption of new revenue standard | New Revenue Standard [Member]	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 (Payments)/Proceeds 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

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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

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