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COMMITMENTS AND CONTINGENCIES: (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
COMMITMENTS AND CONTINGENCIES:      
Term of future commitment for lease payments under noncancellable operating leases (in years) 24 years    
Future commitment for lease payments under noncancellable operating leases $ 83.5    
Total rental expense on operating leases 17.1 $ 14.7 $ 16.3
Future minimum lease payments under all noncancellable operating leases      
2017 15.5    
2018 12.6    
2019 11.1    
2020 10.1    
2021 $ 9.6