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STOCKHOLDERS' EQUITY: - SAR Actvity (Details) - Stock Appreciation Rights (SARs) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Performance-based    
Share-based compensation activity    
Outstanding at the beginning of the period (in shares) 245,404  
Outstanding at the end of the period (in shares) 245,404 245,404
Share-based compensation, Weighted average fair value per share at grant date    
Outstanding at the beginning of the period (in dollars per share) $ 40.00  
Outstanding at the end of the period (in dollars per share) $ 40.00 $ 40.00
Weighted-average remaining contractual term    
Outstanding (in years) 1 year  
Share-based Activity - Other disclosures    
Share-based compensation expense $ 0.2 $ 0.2
Future share-based compensation expense expected $ 0.2  
Vesting based on attainment of certain revenue targets from April 1, 2014 to March 31, 2017    
Share-based compensation, Weighted average fair value per share at grant date    
Granted (in dollars per share)   $ 40
Share-based Activity - Other disclosures    
Aggregate fair value of restricted stock units granted   $ 0.5
Granted (in dollars per share)   $ 40
Performance share awards vested (as a percent)   100.00%
Consecutive trading days during the performance period 20 days  
Vesting based on attainment of certain revenue targets from April 1, 2014 to March 31, 2017 | Maximum    
Share-based Activity - Other disclosures    
Price (in dollars per share) $ 70