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Stock-Based Compensation (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended 0 Months Ended
Dec. 31, 2012
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
2006 Plan And Predecessor Plan [Member]
Mar. 31, 2013
SSARs/ Non-qualified Stock Options [Member]
Mar. 31, 2013
Restricted Shares And Restricted Stock Units [Member]
Dec. 31, 2012
PRSUs [Member]
Mar. 31, 2013
PRSUs [Member]
Feb. 21, 2013
PRSUs [Member]
Chief Executive Officer [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized for grants         12,450,000          
Cumulative grants of equity instruments     12,903,198              
Number of equity instruments forfeited     3,789,320     564,844 645,368      
Period to estabilsh average share price for performance measurement                 90 days  
PRSUs granted                 238,810 300,000
PRSUs vesting equal installments                   3
Compensation expense recognized $ 493,000 $ 3,852,000 $ 6,394,000 $ 11,095,000       $ 1,500,000    
Unrecognized compensation cost           $ 200,000 $ 33,900,000      
Weighted-average period to recognize unrecognized compensation cost (in years)           4 months 24 days 3 years 6 months