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SHARE-BASED COMPENSATION: (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Sep. 30, 2013
Stock options
Sep. 30, 2012
Stock options
Sep. 30, 2013
Restricted stock units
Sep. 30, 2012
Restricted stock units
Sep. 30, 2013
Restricted stock units
Time-vesting
Mar. 31, 2013
Restricted stock units
Time-vesting
Sep. 30, 2013
Restricted stock units
Vesting in equal annual increments over four years
Sep. 30, 2013
Restricted stock units
Vesting in one year
Sep. 30, 2013
Restricted stock units
Performance-based
Mar. 31, 2013
Restricted stock units
Performance-based
Sep. 30, 2013
Restricted stock units
Vesting based on total shareholder return
Minimum
Sep. 30, 2013
Restricted stock units
Vesting based on total shareholder return
Maximum
Share-based compensation                        
Share-based compensation expense $ 1.1 $ 0.9 $ 5.8 $ 4.9                
Future share-based compensation expense expected 5.7   24.8                  
Period for recognition of unrecognized stock-based compensation expense 4 years   4 years                  
Non-vested restricted stock unit activity                        
Outstanding at the beginning of the period (in shares)         1,212,286       863,721      
Granted (in shares)         451,578   395,681 55,897 218,825      
Vested (in shares)         (462,048)              
Forfeited or cancelled (in shares)         (74,993)       (25,304)      
Outstanding at the end of the period (in shares)         1,126,823 1,212,286     1,057,242 863,721    
Non-vested restricted stock units, Weighted average fair value per share at grant date                        
Outstanding at the beginning of the period (in dollars per share)         $ 13.97       $ 11.52      
Granted (in dollars per share)         $ 22.24       $ 23.21      
Vested (in dollars per share)         $ 13.76              
Forfeited or cancelled (in dollars per share)         $ 15.75       $ 17.34      
Outstanding at the end of the period (in dollars per share)         $ 17.27 $ 13.97     $ 13.80 $ 11.52    
Weighted-average remaining contractual term                        
Weighted-average remaining contractual term at the beginning of the period         2 years 7 months 10 days 2 years 2 months 26 days     1 year 7 months 24 days 1 year 7 months 17 days    
Weighted-average remaining contractual term at the end of the period         2 years 7 months 10 days 2 years 2 months 26 days     1 year 7 months 24 days 1 year 7 months 17 days    
Restricted Stock Unit Activity - Other disclosures                        
Pricing model used for share-based compensation arrangement binomial lattice               Monte Carlo      
Aggregate fair value of restricted stock units granted         $ 10.0       $ 5.1      
Performance share awards vested (as a percent)                     0.00% 200.00%
Award vesting period             4 years 1 year