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Consolidated Statement of Shareholders Equity Statement - USD ($)
$ in Thousands
Total
Ordinary Shares
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Beginning balance, Shares at Jun. 30, 2017   (44,080,000)        
Beginning balance, Value at Jun. 30, 2017 $ (74,999) $ (615)   $ (361,376) $ (414,771) $ 113,398
Beginning Treasury Stock, Shares at Jun. 30, 2017     12,665,000      
Beginning Treasury Stock, Value at Jun. 30, 2017     $ 588,365      
Issuance of ordinary shares due to share option exercises, Shares 34,000          
Issuance of ordinary shares due to share option exercises, Value $ (1,700)   (1,581) (119)    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 25,000          
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures $ (1,188)   $ 624 (1,812)    
Stock Issued During Period, Value, Restricted Stock Award, Gross $ (168)          
Stock Issued During Period, Shares, Restricted Stock Award, Gross (2,000)          
Share-based compensation expense $ 7,001          
Treasury Stock, Shares, Acquired (453,000)          
Treasury Stock, Value, Acquired, Cost Method $ (40,674)          
Net Income (Loss) Attributable to Parent 23,366          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (5,864)          
Net unrealized loss on derivative instruments designated and qualifying as cash flow hedges 807          
Foreign currency translation, net of hedges 24,266          
Ending Treasury Stock, Shares at Sep. 30, 2017     13,061,000      
Ending Treasury Stock, Value at Sep. 30, 2017     $ 627,002      
Ending balance, Shares at Sep. 30, 2017   (44,080,000)        
Ending balance, Value at Sep. 30, 2017 84,245 $ 615   366,684 432,273 (88,325)
Beginning balance, Shares at Jun. 30, 2017   (44,080,000)        
Beginning balance, Value at Jun. 30, 2017 (74,999) $ (615)   (361,376) (414,771) 113,398
Beginning Treasury Stock, Shares at Jun. 30, 2017     12,665,000      
Beginning Treasury Stock, Value at Jun. 30, 2017     $ 588,365      
Net Income (Loss) Attributable to Parent 51,033          
Ending Treasury Stock, Shares at Mar. 31, 2018     13,367,000      
Ending Treasury Stock, Value at Mar. 31, 2018     $ 675,536      
Ending balance, Shares at Mar. 31, 2018   (44,080,000)        
Ending balance, Value at Mar. 31, 2018 93,301 $ 615   390,758 459,940 (82,476)
Beginning balance, Shares at Sep. 30, 2017   (44,080,000)        
Beginning balance, Value at Sep. 30, 2017 $ (84,245) $ (615)   (366,684) (432,273) 88,325
Beginning Treasury Stock, Shares at Sep. 30, 2017     13,061,000      
Beginning Treasury Stock, Value at Sep. 30, 2017     $ 627,002      
Issuance of ordinary shares due to share option exercises, Shares 59,000          
Issuance of ordinary shares due to share option exercises, Value $ (2,948)   (2,828) (120)    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 15,000          
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures $ (908)   $ 225 (1,133)    
Share-based compensation expense $ 12,450          
Treasury Stock, Shares, Acquired (121,000)          
Treasury Stock, Value, Acquired, Cost Method $ (14,465)          
Net Income (Loss) Attributable to Parent 29,932          
Net unrealized loss on derivative instruments designated and qualifying as cash flow hedges 1,789          
Foreign currency translation, net of hedges 3,443          
Ending Treasury Stock, Shares at Dec. 31, 2017     13,108,000      
Ending Treasury Stock, Value at Dec. 31, 2017     $ 638,414      
Ending balance, Shares at Dec. 31, 2017   (44,080,000)        
Ending balance, Value at Dec. 31, 2017 $ 119,434 $ 615   378,121 462,205 (83,093)
Issuance of ordinary shares due to share option exercises, Shares 50,000          
Issuance of ordinary shares due to share option exercises, Value $ (2,497)   (2,505) (8)    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures 12,000          
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures $ (1,010)   $ (56) (954)    
Share-based compensation expense $ 13,599          
Treasury Stock, Shares, Acquired (321,000)          
Treasury Stock, Value, Acquired, Cost Method $ (39,571)          
Net Income (Loss) Attributable to Parent (2,265)          
Net unrealized loss on derivative instruments designated and qualifying as cash flow hedges 3,676          
Foreign currency translation, net of hedges (3,059)          
Ending Treasury Stock, Shares at Mar. 31, 2018     13,367,000      
Ending Treasury Stock, Value at Mar. 31, 2018     $ 675,536      
Ending balance, Shares at Mar. 31, 2018   (44,080,000)        
Ending balance, Value at Mar. 31, 2018 93,301 $ 615   390,758 459,940 (82,476)
Beginning balance, Shares at Jun. 30, 2018   (44,080,000)        
Beginning balance, Value at Jun. 30, 2018 $ (93,662) $ (615)   (395,682) (452,756) 69,814
Beginning Treasury Stock, Shares at Jun. 30, 2018 (13,204,434)   13,206,000      
Beginning Treasury Stock, Value at Jun. 30, 2018 $ (685,577)   $ 685,577      
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     20,000      
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures (1,469)   $ 64 (1,533)    
Stock Issued During Period, Value, Restricted Stock Award, Gross $ (288)          
Stock Issued During Period, Shares, Restricted Stock Award, Gross (2,000)          
Share-based compensation expense $ 8,856          
Net Income (Loss) Attributable to Parent (14,639)          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (3,246)          
Net unrealized loss on derivative instruments designated and qualifying as cash flow hedges 1,413          
Foreign currency translation, net of hedges (2,185)          
Ending Treasury Stock, Shares at Sep. 30, 2018     13,188,000      
Ending balance, Shares at Sep. 30, 2018   (44,080,000)        
Ending balance, Value at Sep. 30, 2018 82,104 $ 615 $ (685,801) 403,005 434,871 (70,586)
Beginning balance, Shares at Jun. 30, 2018   (44,080,000)        
Beginning balance, Value at Jun. 30, 2018 $ (93,662) $ (615)   (395,682) (452,756) 69,814
Beginning Treasury Stock, Shares at Jun. 30, 2018 (13,204,434)   13,206,000      
Beginning Treasury Stock, Value at Jun. 30, 2018 $ (685,577)   $ 685,577      
Net Income (Loss) Attributable to Parent $ 60,905          
Ending Treasury Stock, Shares at Mar. 31, 2019 (13,375,839)   13,376,000      
Ending Treasury Stock, Value at Mar. 31, 2019 $ (708,140)   $ 708,140      
Ending balance, Shares at Mar. 31, 2019   (44,080,000)        
Ending balance, Value at Mar. 31, 2019 128,937 $ 615   403,989 503,275 (70,802)
Beginning balance, Shares at Sep. 30, 2018   (44,080,000)        
Beginning balance, Value at Sep. 30, 2018 (82,104) $ (615) $ 685,801 (403,005) (434,871) 70,586
Beginning Treasury Stock, Shares at Sep. 30, 2018     13,188,000      
Issuance of ordinary shares due to share option exercises, Shares     55,000      
Issuance of ordinary shares due to share option exercises, Value (2,442)   $ (2,887) (445)    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     7,000      
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures (360)   $ 146 (506)    
Stock Issued During Period, Value, Restricted Stock Award, Gross $ (312)          
Stock Issued During Period, Shares, Restricted Stock Award, Gross (6,000)          
Share-based compensation expense $ (5,997)          
Treasury Stock, Shares, Acquired (118,000)          
Treasury Stock, Value, Acquired, Cost Method $ (14,043)          
Accretion to Redemption Value (7,140)          
Net Income (Loss) Attributable to Parent 69,014          
Noncontrolling Interest, Decrease from Forfeiture of Shares 591          
Net unrealized loss on derivative instruments designated and qualifying as cash flow hedges (4,623)          
Foreign currency translation, net of hedges 5,887          
Ending Treasury Stock, Shares at Dec. 31, 2018     13,238,000      
Ending Treasury Stock, Value at Dec. 31, 2018     $ 696,499      
Ending balance, Shares at Dec. 31, 2018   (44,080,000)        
Ending balance, Value at Dec. 31, 2018 128,187 $ 615   396,648 496,745 (69,322)
Issuance of ordinary shares due to share option exercises, Shares     4,000      
Issuance of ordinary shares due to share option exercises, Value (317)   $ (210) (107)    
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures     7,000      
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures (297)   $ 223 (520)    
Share-based compensation expense $ 7,754          
Treasury Stock, Shares, Acquired (149,000)          
Treasury Stock, Value, Acquired, Cost Method $ (12,074)          
Net Income (Loss) Attributable to Parent 6,530          
Net unrealized loss on derivative instruments designated and qualifying as cash flow hedges (6,001)          
Foreign currency translation, net of hedges $ 4,521          
Ending Treasury Stock, Shares at Mar. 31, 2019 (13,375,839)   13,376,000      
Ending Treasury Stock, Value at Mar. 31, 2019 $ (708,140)   $ 708,140      
Ending balance, Shares at Mar. 31, 2019   (44,080,000)        
Ending balance, Value at Mar. 31, 2019 $ 128,937 $ 615   $ 403,989 $ 503,275 $ (70,802)