SHARE-BASED COMPENSATION: (Tables)

6 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of option activity

Stock option activity for the six months ended September 30, 2018 was: 

				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, 2018	2,456,184	$	13.30
Exercised	(273,009)	$	9.59		$	7,144
Forfeited or canceled	(18,646)	$	19.07
Outstanding at September 30, 2018	2,164,529	$	13.72	4.9	$	75,248
Exercisable at September 30, 2018	1,951,500	$	14.43	4.7	$	66,462

Summary of stock options outstanding and exercisable

A summary of stock options outstanding and exercisable as of September 30, 2018 was:

					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
$	0.61	—	$	9.99	478,039	5.4 years	$	1.37	341,363	$	1.35
$	10.00	—	$	19.99	1,043,507	4.1 years	$	14.62	967,154	$	14.39
$	20.00	—	$	24.99	636,293	5.9 years	$	21.31	636,293	$	21.31
$	25.00	—	$	32.85	6,690	5.1 years	$	32.85	6,690	$	32.85
					2,164,529	4.9 years	$	13.72	1,951,500	$	14.43

Schedule of performance stock option unit activity

Performance stock option unit activity for the six months ended September 30, 2018 was:

				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, 2018	322,823	$	21.42
Forfeited or canceled	(186,090)	$	21.41
Outstanding at September 30, 2018	136,733	$	21.44	1.6	$	3,698
Exercisable at September 30, 2018	—	$	—	—	$	—

Schedule of time-vesting restricted stock unit activity

Time-vesting restricted stock unit activity for the six months ended September 30, 2018 was:

		Weighted-average
		fair value per		Weighted-average
	Number	share at grant		remaining contractual
	of shares	date		term (in years)
Outstanding at March 31, 2018	2,702,497	$	24.60	2.34
Granted	1,383,409	$	29.15
Vested	(745,573)	$	23.94
Forfeited or canceled	(200,222)	$	25.18
Outstanding at September 30, 2018	3,140,111	$	26.73	2.71

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

Non-vested performance-based restricted stock unit activity for the six months ended September 30, 2018 was:

		Weighted-average
		fair value per		Weighted-average
	Number	share at grant		remaining contractual
	of shares	date		term (in years)
Outstanding at March 31, 2018	561,018	$	25.58	1.67
Granted	186,539	$	31.07
Forfeited or canceled	(110,536)	$	25.08
Outstanding at September 30, 2018	637,021	$	27.28	1.56

Schedule of other performance unit activity

Other performance-based stock unit activity for the six months ended September 30, 2018 was: 

		Weighted-average
		fair value per		Weighted-average
	Number	share at grant		remaining contractual
	of shares	date		term (in years)
Outstanding at March 31, 2018	111,111	$	5.33	-
Vested	(45,364)	$	5.33
Forfeited or canceled	(65,747)	$	5.33
Outstanding at September 30, 2018	—	$	—	-