SHARE-BASED COMPENSATION: (Tables)

6 Months Ended

Sep. 30, 2015

SHARE-BASED COMPENSATION:

Schedule of option activity

	Number of shares		Weighted-average exercise price per share		Weighted-average remaining contractual term (in years)	Aggregate intrinsic value (in thousands)
Outstanding at March 31, 2015	4,870,219		$	15.10
Granted	445,785		$	17.84
Exercised	(438,979	)	$	10.16		$	3,012
Forfeited or cancelled	(693,809	)	$	25.71
Outstanding at September 30, 2015	4,183,216		$	14.15	5.21	$	27,586
Exercisable at September 30, 2015	2,858,695		$	14.72	3.72	$	17,874

Summary of stock options outstanding and exercisable

	Options outstanding				Options exercisable
Range of exercise price per share	Options outstanding	Weighted-average remaining contractual life	Weighted-average exercise price per share		Options exercisable	Weighted-average exercise price per share
$ 0.63 - $ 8.90	953,132	6.35 years	$	1.69	502,923	$	1.71
$ 11.08 - $ 14.42	1,229,467	4.56 years	$	13.17	1,116,140	$	13.16
$ 15.10 - $ 19.76	866,027	5.77 years	$	17.14	442,448	$	16.52
$ 20.44 - $ 25.00	1,039,737	4.77 years	$	21.88	716,996	$	22.18
$ 26.33 - $ 62.06	94,853	1.73 years	$	40.00	80,188	$	41.31
	4,183,216	5.21 years	$	14.15	2,858,695	$	14.72

Summary of SAR activity

	Number of shares	Weighted-average exercise price per share		Weighted-average remaining contractual term (in years)	Aggregate intrinsic value (in thousands)
Outstanding at March 31, 2015	245,404	$	40.00
Outstanding at September 30, 2015	245,404	$	40.00	1.50	$	—
Exercisable at September 30, 2015	—	$	—	—	$	—

Schedule of non-vested time-vesting restricted stock unit activity

	Number of shares		Weighted-average fair value per share at grant date		Weighted-average remaining contractual term (in years)
Outstanding at March 31, 2015	2,053,179		$	20.40	1.95
Granted	1,057,236		$	18.17
Vested	(879,557	)	$	20.10
Forfeited or cancelled	(121,444	)	$	19.63
Outstanding at September 30, 2015	2,109,414		$	19.45	2.40

Schedule of non-vested performance-based restricted stock unit activity

	Number of shares		Weighted-average fair value per share at grant date		Weighted-average remaining contractual term (in years)
Outstanding at March 31, 2015	389,310		$	21.12	1.57
Granted	340,219		$	18.23
Forfeited or cancelled	(66,204	)	$	20.32
Outstanding at September 30, 2015	663,325		$	19.72	1.78

Summary of other performance unit activity

	Number of shares	Weighted-average fair value per share at grant date		Weighted-average remaining contractual term (in years)
Outstanding at March 31, 2015	312,575	$	5.23
Granted	323,080	$	2.94
Outstanding at September 30, 2015	635,655	$	4.07	1.81