SUBSEQUENT EVENTS: (USD $)	12 Months Ended			43 Months Ended	0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2015	May 20, 2015	Nov. 12, 2014
Subsequent Event
Maximum amount of common stock that may be repurchased						$ 250,000,000
Value of shares repurchased	9,868,000	52,663,000	71,744,000	202,400,000
Remaining capacity under the stock repurchase program	47,600,000			47,600,000
Subsequent event
Subsequent Event
Increase in common stock that may be repurchased					50,000,000
Maximum amount of common stock that may be repurchased					300,000,000
Value of shares repurchased				202,400,000
Remaining capacity under the stock repurchase program	97,600,000			97,600,000
Share repurchases limit dependant upon leverage ratio					100,000,000
Subsequent event | IT Infrastructure Management Business
Subsequent Event
Proceeds from sale of net assets of a business					140,000,000
Contingent payments receivable subject to certain performance metrics					$ 50,000,000
Percentage retained profits in the divested entity					5.00%