STOCKHOLDERS' EQUITY: (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended			67 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2017	Jul. 28, 2016
Authorized shares and par value disclosure
Common stock, authorized shares	200,000,000	200,000,000		200,000,000
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10		$ 0.10
Preferred stock, authorized shares	1,000,000			1,000,000
Preferred stock, par value (in dollars per share)	$ 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
Number of shares repurchased				16,800,000
Repurchase of treasury stock	$ 30,542	$ 52,764	$ 9,868
Value of shares repurchased	30,542	52,764	9,868	$ 285,700
Remaining capacity under the stock repurchase program	114,300			$ 114,300
Dividends paid on common stock	$ 0	$ 0	$ 0
Common stock repurchase program
Stockholders' Equity
Maximum amount of common stock that may be repurchased					$ 400,000
Number of shares repurchased	1,300,000	2,600,000	500,000
Repurchase of treasury stock	$ 30,500	$ 52,800	$ 9,900