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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]
Retained Earnings [Member]
Retained Earnings [Member]
Class A [Member]
Retained Earnings [Member]
Class B [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Loss [Member]
Total
Class A [Member]
Class B [Member]
Balance at Apr. 30, 2014 $ 69,798 $ 13,392 $ 327,588 $ 1,489,069     $ (527,308) $ (190,291) $ 1,182,248    
Restricted Shares Issued under Stock-based Compensation Plans     (3,471)       4,085   614    
Net (Payments)/Proceeds from Exercise of Stock Options and Other     12,093       13,230   25,323    
Excess Tax Benefits from Stock-based Compensation     3,191           3,191    
Stock-based Compensation Expense     13,617           13,617    
Purchase of Treasury Shares             (61,981)   (61,981)    
Common Stock Dividends         $ (57,541) $ (10,957)       $ (57,541) $ (10,957)
Comprehensive Income (Loss)       176,868       (216,342) (39,474)    
Balance at Apr. 30, 2015 69,798 13,392 353,018 1,597,439     (571,974) (406,633) 1,055,040    
Restricted Shares Issued under Stock-based Compensation Plans     (3,152)       3,325   173    
Net (Payments)/Proceeds from Exercise of Stock Options and Other     1,700       (1,795)   (95)    
Excess Tax Benefits from Stock-based Compensation     1,027           1,027    
Stock-based Compensation Expense     16,105           16,105    
Purchase of Treasury Shares             (69,977)   (69,977)    
Common Stock Dividends         (58,658) (11,238)       (58,658) (11,238)
Comprehensive Income (Loss)       145,782       (41,053) 104,729    
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     (7,617)       8,013   396    
Net (Payments)/Proceeds from Exercise of Stock Options and Other     8,849       6,657   15,506    
Excess Tax Benefits from Stock-based Compensation     414           414    
Stock-based Compensation Expense     17,552           17,552    
Purchase of Treasury Shares             (50,326)   (50,326)    
Common Stock Dividends         $ (60,143) $ (11,402)       $ (60,143) $ (11,402)
Common Stock Class Conversions 288 (296)             (8)    
Comprehensive Income (Loss)       113,643       (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