COMMITMENTS AND CONTINGENCIES: (Details) (Operating lease and licensing agreements, USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Operating lease and licensing agreements
Commitments
Future commitment for lease or license payments under noncancellable operating leases or licenses (in years)	P28Y
Future commitment for lease or license payments under noncancellable operating leases or licenses	$ 129.7
Total rental expense on operating leases and software licenses	23.9	34.3	35.7
Future minimum lease payments under all noncancellable operating leases and software licenses
2013	22.9
2014	21.8
2015	15.9
2016	13.1
2017	$ 12.4