STOCKHOLDERS' EQUITY: (Details) (USD $)	12 Months Ended			43 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2015	Nov. 12, 2014
Authorized shares and par value disclosure
Common stock, authorized shares	200,000,000	200,000,000	200,000,000	200,000,000
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Preferred stock, authorized shares	1,000,000	1,000,000	1,000,000	1,000,000
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Stockholders' Equity
Number of warrants outstanding (in shares)	4,942			4,942
Warrants exercise price (in dollars per share)	$ 13.24			$ 13.24
Maximum amount of common stock that may be repurchased					$ 250,000,000
Number of shares repurchased	500,000	2,000,000	4,600,000	12,900,000
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
Dividends paid on common stock	$ 0	$ 0	$ 0