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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]
Balance at Apr. 30, 2017	$ 70,086	$ 13,096	$ 387,896			$ 1,715,423			$ (676,077)			$ (507,287)			$ 1,003,137
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Shares Issued under Stock-based Compensation Plans	0	0	(2,706)			(10)			2,904			0			188
Net (Payments)/Proceeds from Exercise of Stock Options and Other	0	0	14,327			0			16,279			0			30,606
Excess Tax Benefits from Stock-based Compensation	0	0	0			0			0			0			0
Stock-based Compensation Expense	0	0	6,450			0			60			0			6,510
Purchase of Treasury Shares	0	0	0			0			(29,257)			0			(29,257)
Common Stock Dividends	0	0		$ 0	$ 0		$ (46,294)	$ (8,799)		$ 0	$ 0		$ 0	$ 0		$ (46,294)	$ (8,799)
Common Stock Class Conversions	21	(21)	0			0			0			0			0
Comprehensive Income (Loss)	0	0	0			138,126			0			74,109			212,235
Balance at Jan. 31, 2018	70,107	13,075	405,967			1,798,446			(686,091)			(433,178)			1,168,326
Balance at Oct. 31, 2017	70,097	13,085	392,493			1,747,998			(699,898)			(476,726)			1,047,050
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Restricted Shares Issued under Stock-based Compensation Plans	0	0	(441)			0			489			0			48
Net (Payments)/Proceeds from Exercise of Stock Options and Other	0	0	10,001			0			13,258			0			23,259
Excess Tax Benefits from Stock-based Compensation	0	0	0			0			0			0			0
Stock-based Compensation Expense	0	0	3,914			0			60			0			3,974
Purchase of Treasury Shares	0	0	0			0			0			0			0
Common Stock Dividends	0	0		0	0		(15,463)	(2,931)		0	0		0	0		(15,463)	(2,931)
Common Stock Class Conversions	10	(10)	0			0			0			0			0
Comprehensive Income (Loss)	0	0	0			68,842			0			43,547			112,390
Balance at Jan. 31, 2018	70,107	13,075	405,967			1,798,446			(686,091)			(433,178)			1,168,326
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
Excess Tax Benefits from Stock-based Compensation	0	0	0			0			0			0			0
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 Income (Loss)	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)
Excess Tax Benefits from Stock-based Compensation	0	0	0			0			0			0			0
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)
Common Stock Class Conversions	0	0	0			0			0			0			0
Issuance of Warrants Related to Acquisition of a Business	0	0	565			0			0			0			565
Comprehensive Income (Loss)	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

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- Definition

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) 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 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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Value, after forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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Value of stock issued as a result of the exercise of stock options.

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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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