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Consolidated Statements Of Other Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]        
Net income for the period $ 53,500 $ 61,108 $ 84,130 $ 80,537
Net foreign currency translation adjustments 113 (989) 354 (1,465)
Unrealized gain (loss) (1,433) (495) 87 2,005
(Gain) loss reclassified into net income 589 (958) 1,173 (1,514)
Actuarial gain (loss) 944 (695) 1,027 (876)
Amortization of actuarial loss into net income 73 75 146 147
Total other comprehensive income (loss), net, for the period 286 (3,062) 2,787 (1,703)
Total comprehensive income $ 53,786 $ 58,046 $ 86,917 $ 78,834