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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, 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 0 0 (3,152)     0     3,325     0     173    
Net (Payments)/Proceeds from Exercise of Stock Options and Other 0 0 1,700     0     (1,795)     0     (95)    
Excess Tax Benefits from Stock-based Compensation 0 0 1,027     0     0     0     1,027    
Stock-based Compensation Expense 0 0 16,105     0     0     0     16,105    
Purchase of Treasury Shares 0 0 0     0     (69,977)     0     (69,977)    
Common Stock Dividends 0 0   $ 0 $ 0   $ (58,658) $ (11,238)   $ 0 $ 0   $ 0 $ 0   $ (58,658) $ (11,238)
Comprehensive Income (Loss) 0 0 0     145,782     0     (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 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) 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) 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