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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2016
EARNINGS (LOSS) PER SHARE AND STOCKHOLDERS' EQUITY:
Net earnings (loss) from continuing operations	$ 7,140	$ (1,345)	$ 11,116	$ (6,527)
Net earnings from discontinued operations, net of tax		12,068		16,211
Net earnings	$ 7,140	$ 10,723	$ 11,116	$ 9,684
Basic earnings (loss) per share:
Basic weighted-average shares outstanding	77,446	77,960	77,459	77,939
Continuing operations (in dollars per share)	$ 0.09	$ (0.02)	$ 0.14	$ (0.08)
Discontinued operations (in dollars per share)		0.15		0.21
Net earnings (in dollar per share)	$ 0.09	$ 0.14	$ 0.14	$ 0.12
Diluted earnings (loss) per share:
Basic weighted-average shares outstanding	77,446	77,960	77,459	77,939
Dilutive effect of common stock options, warrants, and restricted stock as computed under the treasury stock method (in shares)	1,831		1,858
Diluted weighted-average shares outstanding	79,277	77,960	79,317	77,939
Continuing operations (in dollars per share)	$ 0.09	$ (0.02)	$ 0.14	$ (0.08)
Net earnings from discontinued operations (in dollars per share)		0.15		0.21
Net earnings (in dollars per share)	$ 0.09	$ 0.14	$ 0.14	$ 0.12
Stockholders' Equity
Number of shares outstanding under options, warrants and restricted stock units (in shares)	39	1,946	263	1,915
Repurchase of treasury stock			$ 30,542	$ 27,261
Cumulative amount paid for repurchase of treasury stock	$ 1,038,129		1,038,129		$ 1,003,382
Common stock repurchase program
Stockholders' Equity
Maximum amount of common stock that may be repurchased	$ 400,000		$ 400,000
Number of shares repurchased			1,300
Repurchase of treasury stock			$ 30,500
Cumulative shares repurchased	16,800		16,800
Cumulative amount paid for repurchase of treasury stock	$ 285,700		$ 285,700
Remaining capacity under the stock repurchase program	$ 114,300		$ 114,300
Options, Warrants And Restricted Stock Units
Stockholders' Equity
Number of shares outstanding under options, warrants and restricted stock units (in shares)				1,400
Options, Warrants And Restricted Stock Units | Minimum
Stockholders' Equity
Range of exercise prices for options and warrants (in dollars per share)	$ 20.27	$ 2.58	$ 20.27	$ 2.58
Options, Warrants And Restricted Stock Units | Maximum
Stockholders' Equity
Range of exercise prices for options and warrants (in dollars per share)	$ 32.85	$ 62.06	$ 32.85	$ 62.06