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Stock-Based Compensation (Details Textual) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Sep. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]            
Weighted average grant-date fair value per share of the restricted stock units awarded $ 8.51     $ 11.97 $ 8.75 $ 8.00
Forfeiture rate   5.80% 6.70%      
Unearned stock-based compensation $ 32.6       $ 32.6  
Weighted-average period over which the unearned stock-based compensation is expected to be recognized, years         2 years 4 months 12 days