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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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