EARNINGS (LOSS) PER SHARE AND STOCKHOLDERS' EQUITY: (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Basic earnings (loss) per share:
Net loss from continuing operations	$ (1,345)	$ (7,101)	$ (6,527)	$ (17,842)
Net earnings from discontinued operations	12,068	5,557	16,211	8,694
Net earnings (loss)	$ 10,723	$ (1,544)	$ 9,684	$ (9,148)
Basic weighted-average shares outstanding	77,960	77,123	77,939	76,978
Continuing operations (in dollars per share)	$ (0.02)	$ (0.09)	$ (0.08)	$ (0.23)
Discontinued operations (in dollars per share)	0.15	0.07	0.21	0.11
Net earnings (loss) (in dollars per share)	$ 0.14	$ (0.02)	$ 0.12	$ (0.12)
Diluted earnings (loss) per share:
Basic weighted-average shares outstanding	77,960	77,123	77,939	76,978
Diluted weighted-average shares outstanding	77,960	77,123	77,939	76,978
Continuing operations (in dollars per share)	$ (0.02)	$ (0.09)	$ (0.08)	$ (0.23)
Discontinued operations (in dollars per share)	0.15	0.07	0.21	0.11
Net earnings (loss) (in dollars per share)	$ 0.14	$ (0.02)	$ 0.12	$ (0.12)
Stockholders' Equity
Number of shares outstanding under options, warrants and restricted stock units	1,946	3,446	1,915	1,813
Repurchase of treasury stock			$ 27,261	$ 9,868
Cumulative amount paid for repurchase of treasury stock	$ 977,219		$ 977,219		$ 945,274
Options, warrants and restricted stock units
Stockholders' Equity
Number of shares outstanding under options, warrants and restricted stock units	1,400		1,400
Minimum
Stockholders' Equity
Range of exercise prices for options and warrants (in dollars per share)	$ 2.58	$ 19.02	$ 2.58	$ 21.17
Maximum
Stockholders' Equity
Range of exercise prices for options and warrants (in dollars per share)	$ 62.06	$ 62.06	$ 62.06	$ 62.06
2011 Common stock repurchase program
Stockholders' Equity
Maximum amount of common stock that may be repurchased	$ 300,000		$ 300,000
Shares repurchased			1,400
Repurchase of treasury stock			$ 27,300
Cumulative shares repurchased	14,300		14,300
Cumulative amount paid for repurchase of treasury stock	$ 229,700		$ 229,700
Remaining capacity under the stock repurchase program	$ 70,300		$ 70,300