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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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