STOCKHOLDERS' EQUITY: (Details) (USD $)	1 Months Ended	12 Months Ended		20 Months Ended
	Aug. 31, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013
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
Outstanding warrants
Number of warrants outstanding (in shares)		1,374,959		1,374,959
Weighted average exercise price (in dollars per share)		$ 16.09		$ 16.09
Stockholders' Equity
Maximum amount of common stock that may be repurchased	$ 200,000,000
Number of shares repurchased		4,600,000	5,800,000	10,400,000
Value of shares repurchased		71,744,000	68,169,000	139,900,000
Remaining repurchase capacity		60,100,000
Dividends paid on common stock		$ 0
AISS acquisition (fiscal 2003)
Outstanding warrants
Number of warrants outstanding (in shares)		1,272,024		1,272,024
Weighted average exercise price (in dollars per share)		$ 16.32		$ 16.32
Toplander acquisition (fiscal 2003)
Outstanding warrants
Number of warrants outstanding (in shares)		102,935		102,935
Weighted average exercise price (in dollars per share)		$ 13.24		$ 13.24