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STOCKHOLDERS' EQUITY: - Performance Based (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2018
$ / shares
shares
Mar. 31, 2018
USD ($)
tranche
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
shares
Restricted stock units        
Future expense        
2019 | $   $ 35.0    
2020 | $   25.2    
2021 | $   13.1    
2022 | $   2.5    
Share-based compensation expense | $   $ 39.1 $ 33.3 $ 19.4
Performance Stock | Restricted stock units        
Share-based compensation activity        
Outstanding at the beginning of the period (in shares) 682,763 732,711    
Granted (in shares)   425,880    
Additional earned performance shares (in shares)   359,206 94,775  
Vested (in shares)   (781,622) (252,760)  
Forfeited or cancelled (in shares)   (53,412)    
Outstanding at the end of the period (in shares)   682,763 732,711  
Share-based compensation, Weighted average fair value per share at grant date        
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 25.23 $ 20.89    
Granted (in dollars per share) | $ / shares   26.24    
Additional earned performance shares (in dollars per share) | $ / shares   18.96    
Vested (in dollars per share) | $ / shares   19.00    
Forfeited or cancelled (in dollars per share) | $ / shares   22.64    
Outstanding at the end of the period (in dollars per share) | $ / shares   $ 25.23 $ 20.89  
Weighted-average remaining contractual term        
Weighted-average remaining contractual term (in years)   1 year 6 months 14 days 1 year 1 month 17 days  
Share-based Activity - Other disclosures        
Aggregate fair value of restricted stock units granted | $   $ 11.2    
Future expense        
Issued (in shares)   252,760    
Vesting percentage   160.00%    
Vesting on first anniversary on closing date | Restricted stock units        
Share-based compensation activity        
Granted (in shares)   221,746 263,835 367,807
Vested (in shares)   0   0
Share-based Activity - Other disclosures        
Aggregate fair value of restricted stock units granted | $   $ 6.2 $ 6.6 $ 6.8
Modified (in shares)     9,416  
Cancelled (in shares)     14,349  
Grants after modification (in shares)     254,419  
Aggregate fair value of restricted stock units grants after modification | $     $ 6.3  
Vesting on first anniversary on closing date | Minimum | Restricted stock units        
Future expense        
Performance share awards vested (as a percent)   0.00% 0.00% 0.00%
Vesting on first anniversary on closing date | Maximum | Restricted stock units        
Future expense        
Performance share awards vested (as a percent)   200.00% 200.00% 200.00%
Vesting Based on Relevant Performance Period Over Two Periods at March 31 2018 | Restricted stock units        
Share-based compensation activity        
Granted (in shares)   87,184    
Share-based Activity - Other disclosures        
Aggregate fair value of restricted stock units granted | $   $ 2.1    
Vesting On First Anniversary On Closing Date Based on Relevant Performance Period Over Two Periods at March 31 2018 | Minimum | Restricted stock units        
Future expense        
Performance share awards vested (as a percent)   0.00%    
Vesting On First Anniversary On Closing Date Based on Relevant Performance Period Over Two Periods at March 31 2018 | Maximum | Restricted stock units        
Future expense        
Performance share awards vested (as a percent)   75.00%    
Vesting On Second Anniversary On Closing Date Based on Relevant Performance Period Over Two Periods at March 31 2018 | Minimum | Restricted stock units        
Future expense        
Performance share awards vested (as a percent)   0.00%    
Vesting On Second Anniversary On Closing Date Based on Relevant Performance Period Over Two Periods at March 31 2018 | Maximum | Restricted stock units        
Future expense        
Performance share awards vested (as a percent)   150.00%    
Performance-based Restricted Stock Units Vesting In Three Equal Tranches | Restricted stock units        
Share-based compensation activity        
Granted (in shares)   116,950    
Share-based Activity - Other disclosures        
Aggregate fair value of restricted stock units granted | $   $ 2.9    
Future expense        
Number of tranches | tranche   3    
Vesting percentage   53.00%    
Performance-based Restricted Stock Units Vesting In Three Equal Tranches | Minimum | Restricted stock units        
Future expense        
Vesting percentage   0.00%    
Performance-based Restricted Stock Units Vesting In Three Equal Tranches | Maximum | Restricted stock units        
Future expense        
Vesting percentage   300.00%    
Shares Vesting Based On Attainment Level Based On Performance Results At March 31 2018 | Restricted stock units        
Share-based compensation activity        
Vested (in shares)   (157,985)    
Vesting based on relevant performance period at March 31 2017        
Future expense        
Issued (in shares)     24,573  
Forfeited or cancelled (in shares)     260,045  
Vesting percentage     9.00%  
Vesting based on relevant performance period at March 31 2018 | Restricted stock units        
Share-based compensation activity        
Vested (in shares)   (528,862)    
Vesting based on relevant performance period at March 31 2018 | Common Stock        
Share-based compensation activity        
Additional earned performance shares (in shares)   264,431    
Future expense        
Issued (in shares)   528,862    
Shares Vesting At 200% Attainment Level Based On Performance Results | Restricted stock units        
Share-based compensation activity        
Vested (in shares)   (264,431)    
Future expense        
Vesting percentage   200.00%    
Scenario, Forecast | Performance-based Restricted Stock Units Vesting In Three Equal Tranches | Restricted stock units        
Share-based compensation activity        
Vested (in shares) (18,868)      
Forfeited or cancelled (in shares) (16,551)