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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]
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 (2,156)     (1)     2,203     0     46    
Net (Payments)/Proceeds from Exercise of Stock Options and Other 0 0 4,594     0     3,286     0     7,880    
Stock-based Compensation Expense 0 0 3,930     0     0     0     3,930    
Purchase of Treasury Shares 0 0 0     0     (7,994)     0     (7,994)    
Common Stock Dividends 0 0   $ 0 $ 0   $ (16,022) $ (3,021)   $ 0 $ 0   $ 0 $ 0   $ (16,022) $ (3,021)
Common Stock Class Conversions 4 (4) 0     0     0     0     0    
Comprehensive (Loss) Income, Net of Tax 0 0 0     26,295     0     (32,166)     (5,871)    
Balance at Jul. 31, 2018 70,115 13,067 413,488     1,845,811     (696,727)     (471,746)     1,174,008    
Balance at Apr. 30, 2019 70,127 13,055 422,305     1,931,074     (746,476)     (508,738)     1,181,347    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                  
Restricted Shares Issued under Stock-based Compensation Plans 0 0 (2,112)     (1)     2,219     0     106    
Net (Payments)/Proceeds from Exercise of Stock Options and Other 0 0 107     0     (1,244)     0     (1,137)    
Stock-based Compensation Expense 0 0 4,604     0     0     0     4,604    
Purchase of Treasury Shares 0 0 0     0     (10,000)     0     (10,000)    
Common Stock Dividends 0 0   $ 0 $ 0   $ (16,148) $ (3,104)   $ 0 $ 0   $ 0 $ 0   $ (16,148) $ (3,104)
Common Stock Class Conversions 12 (12) 0     0     0     0     0    
Comprehensive (Loss) Income, Net of Tax 0 0 0     3,624     0     (27,286)     (23,662)    
Balance at Jul. 31, 2019 $ 70,139 $ 13,043 $ 424,904     $ 1,915,445     $ (755,501)     $ (536,024)     $ 1,132,006