SHARE-BASED COMPENSATION: (Tables)

6 Months Ended

Sep. 30, 2016

Schedule of option activity

				Weighted-‑average
		Weighted-average		remaining	Aggregate
	Number of	exercise price		contractual term	Intrinsic value
	shares	per share		(in years)	(in thousands)
Outstanding at March 31, 2016	3,604,102	$	14.52
Exercised	(498,180)	$	13.82		$	4,848
Forfeited or cancelled	(47,833)	$	16.24
Outstanding at September 30, 2016	3,058,089	$	14.60	5.4	$	36,961
Exercisable at September 30, 2016	2,353,864	$	14.49	4.6	$	28,685

Summary of stock options outstanding and exercisable

					Options outstanding					Options exercisable
Range of						Weighted-average		Weighted-average			Weighted-average
exercise price					Options	remaining		exercise price		Options	exercise price
per share					outstanding	contractual life		per share		exercisable	per share
$	0.85	-	$	9.99	581,070	6.6	years	$	1.86	403,973	$	1.80
$	10.00	-	$	19.99	1,611,798	5.3	years	$	15.22	1,294,109	$	14.59
$	20.00	-	$	24.99	845,669	4.6	years	$	21.77	646,008	$	21.95
$	25.00	-	$	32.85	19,552	7.1	years	$	32.85	9,774	$	32.85
					3,058,089	5.4	years	$	14.60	2,353,864	$	14.49

Schedule of stock appreciation right (SAR) activity

				Weighted-average
			Weighted-average	remaining		Aggregate
	Number		exercise price	contractual term		intrinsic value
	of shares		per share	(in years)		(in thousands)
Outstanding at March 31, 2016	245,404	$	40.00
Outstanding at September 30, 2016	245,404	$	40.00	0.5	$	—
Exercisable at September 30, 2016	—	$	—	—	$	—

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

Non-vested time-vesting restricted stock unit activity for the six-month period ended September 30, 2016 was:

		Weighted average
		fair value per		Weighted-average
	Number	share at  grant		remaining contractual
	of shares	date		term (in years)
Outstanding at March 31, 2016	2,279,895	$	19.69	2.12
Granted	1,257,215	$	21.74
Vested	(772,762)	$	20.28
Forfeited or cancelled	(95,560)	$	19.38
Outstanding at September 30, 2016	2,668,788	$	20.50	2.64

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

Non-vested performance-based restricted stock unit activity for the six-month period ended September 30, 2016 was:

		Weighted average
		fair value per		Weighted-average
	Number	share at  grant		remaining contractual
	of shares	date		term (in years)
Outstanding at March 31, 2016	516,818	$	18.62	1.67
Granted	254,419	$	24.66
Forfeited or cancelled	(26,142)	$	17.57
Outstanding at September 30, 2016	745,095	$	20.72	1.63

Schedule of other performance unit activity

		Weighted average
		fair value per		Weighted-average
	Number	share at grant		remaining contractual
	of shares	date		term (in years)
Outstanding at March 31, 2016	635,655	$	4.07	1.30
Outstanding at September 30, 2016	635,655	$	4.07	0.80

Stock option

Schedule of stock appreciation right (SAR) activity

				Weighted-average
			Weighted-average	remaining		Aggregate
	Number		exercise price	contractual term		intrinsic value
	of shares		per share	(in years)		(in thousands)
Outstanding at March 31, 2016	—	$	—
Granted	633,604	$	21.40
Outstanding at September 30, 2016	633,604	$	21.40	1.6	$	3,326
Exercisable at September 30, 2016	—	$	—	—	$	—