COMMITMENTS AND CONTINGENCIES: (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Operating lease and licensing agreements
Commitments
Future commitment for lease payments under noncancellable operating leases		P27Y
Future commitment for lease payments under noncancellable operating leases	$ 132.0	$ 132.0
GoDigital
Commitments
Percentage of interest acquired	70.00%	70.00%
Pending legal matters
Commitments
Period of dispute investigation		30 days
Accrual for gains, losses and other expenses	2.5
Threatened legal matters | GoDigital
Commitments
Performance of the business period		2 years
Threatened legal matters | GoDigital | Subsequent event
Commitments
Consideration to purchase the founders' remaining holdings under settlement agreement	1.3	1.3
Amount accrued for the settlement which represents a settlement expense	0.7	0.7
Fair value of founders' shares recorded as the purchase price for the founders' interests	$ 0.6	$ 0.6