SHARE-BASED COMPENSATION: (Tables)

9 Months Ended

Dec. 31, 2017

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

Schedule of option activity

Stock option activity for the nine months endedDecember 31, 2017 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, 2017	3,033,071		$	13.14
Performance units converted to options	299,641		$	21.32
Exercised	(526,842	)	$	15.05		$	6,044
Forfeited or canceled	(88,870	)	$	20.08
Outstanding at December 31, 2017	2,717,000		$	13.45	5.7	$	38,448
Exercisable at December 31, 2017	2,109,993		$	13.53	5.1	$	29,701

Summary of stock options outstanding and exercisable

A summary of stock options outstanding and exercisable as of December 31, 2017 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	690,169	6.4 years	$	1.68	474,434	$	1.77
$	10.00	—	$	19.99	1,262,595	4.9 years	$	14.94	1,076,909	$	14.47
$	20.00	—	$	24.99	744,684	6.6 years	$	21.31	539,098	$	21.33
$	25.00	—	$	32.85	19,552	5.9 years	$	32.85	19,552	$	32.85
					2,717,000	5.7 years	$	13.45	2,109,993	$	13.53

Schedule of stock appreciation right (SAR) activity

Performance stock option unit activity for the nine months endedDecember 31, 2017 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, 2017	555,123		$	21.41
Performance units converted to options	(183,322	)	$	21.41
Forfeited or canceled	(25,201	)	$	21.32
Outstanding at December 31, 2017	346,600		$	21.41	1.9	$	2,131
Exercisable at December 31, 2017	—		$	—	—	$	—

SAR activity for the nine months endedDecember 31, 2017 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, 2017	245,404		$	40.00
Forfeited or canceled	(245,404	)	$	40.00
Outstanding at December 31, 2017	—		$	—	—	$	—

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

Non-vested time-vesting restricted stock unit activity for the nine months endedDecember 31, 2017 was:

			Weighted-average
			fair value per		Weighted-average
	Number		share at grant		remaining contractual
	of shares		date		term (in years)
Outstanding at March 31, 2017	3,307,577		$	22.57	2.45
Granted	1,687,416		$	26.17
Vested	(1,067,370	)	$	22.30
Forfeited or canceled	(345,581	)	$	23.36
Outstanding at December 31, 2017	3,582,042		$	24.27	2.48

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

Non-vested performance-based restricted stock unit activity for the nine months endedDecember 31, 2017 was:

			Weighted-average
			fair value per		Weighted-average
	Number		share at grant		remaining contractual
	of shares		date		term (in years)
Outstanding at March 31, 2017	732,711		$	20.89	1.13
Granted	425,880		$	26.22
Additional earned performance shares	94,775		$	19.46
Vested	(252,760	)	$	19.46
Forfeited or canceled	(48,422	)	$	22.00
Outstanding at December 31, 2017	952,184		$	23.45	1.37

Schedule of other performance unit activity

Other performance-based stock unit activity for the nine months endedDecember 31, 2017 was: 

			Weighted-average
			fair value per		Weighted-average
	Number		share at grant		remaining contractual
	of shares		date		term (in years)
Outstanding at March 31, 2017	597,193		$	4.14	0.30
Vested	(24,573	)	$	2.94
Forfeited or canceled	(461,509	)	$	3.92
Outstanding at December 31, 2017	111,111		$	5.33	0.25