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SHARE-BASED COMPENSATION: (Details 5) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Jul. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Share-based Activity - Other disclosures      
Options outstanding (in shares)   3,908,957  
ITO      
Share-based compensation activity      
Vested (in shares) (71,914)    
Share-based Activity - Other disclosures      
Share-based compensation expense   $ 1.0 $ 0.4
Options outstanding (in shares)   15,886  
Restricted Stock Units vested (in shares) 71,914    
Performance-based      
Share-based compensation activity      
Outstanding at the beginning of the period (in shares)   312,575  
Granted (in shares)   323,080  
Outstanding at the end of the period (in shares)   635,655  
Share-based compensation, Weighted average fair value per share at grant date      
Outstanding at the beginning of the period (in dollars per share)   $ 5.23  
Granted (in dollars per share)   2.94  
Outstanding at the end of the period (in dollars per share)   $ 4.07  
Weighted-average remaining contractual term      
Outstanding at the end of the period   1 year 6 months 18 days  
Share-based Activity - Other disclosures      
Aggregate fair value of restricted stock units granted   $ 0.9  
Share awards vesting percentage (as a percent)   100.00%  
Pricing model used for share-based compensation arrangement   Monte Carlo  
Share-based compensation expense   $ 0.6  
Future share-based compensation expense expected   $ 1.6 $ 1.6
Period for recognition of unrecognized stock-based compensation expense   3 years 3 years
Stock options      
Share-based Activity - Other disclosures      
Pricing model used for share-based compensation arrangement   binomial lattice  
Share-based compensation expense   $ 8.0 $ 7.0
Period for recognition of unrecognized stock-based compensation expense   4 years  
Minimum | Performance-based      
Share-based Activity - Other disclosures      
Share price factor (as a percent)   0.00%  
Common Stock Price   $ 25  
Maximum | Performance-based      
Share-based Activity - Other disclosures      
Share price factor (as a percent)   100.00%  
Common Stock Price   $ 55