SHARE-BASED COMPENSATION: (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Aug. 18, 2015 shares	Jun. 30, 2015 USD ($) multiple $ / shares shares	Jun. 30, 2014 USD ($)
Stock Option Activity - Number of Shares
Outstanding at the beginning of the period (in shares)		4,870,219
Granted (in shares)		426,380
Exercised (in shares)		(114,534)
Forfeited or cancelled (in shares)		(266,442)
Outstanding at the end of the period (in shares)		4,915,623
Exercisable at the end of the period (in shares)		3,239,911
Weighted-average exercise price per share
Outstanding at the beginning of the period (in dollars per share) | $ / shares		$ 15.11
Granted (in dollars per share) | $ / shares		17.73
Exercised (in dollars per share) | $ / shares		5.92
Forfeited or cancelled (in dollars per share) | $ / shares		28.68
Outstanding at the end of the period (in dollars per share) | $ / shares		14.81
Exercisable at the end of the period (in dollars per share) | $ / shares		$ 16.66
Weighted-average remaining contractual term
Outstanding at the end of the period		4 years 11 months 1 day
Exercisable at the end of the period		3 years 3 months 11 days
Aggregate intrinsic value
Exercised | $		$ 1,337
Outstanding at the end of the period | $		23,091
Exercisable at the end of the period | $		$ 10,911
Stock Option and Equity Compensation Plans
Share-based compensation
Aggregate number of shares reserved for issuance under equity compensation plans since the inception of such plans		26,400,000
Shares which remained available for future grants		2,200,000
Forecast | Stock Option and Equity Compensation Plans
Share-based compensation
Aggregate number of shares reserved for issuance under equity compensation plans since the inception of such plans	30,500,000
Additional number of shares reserved for issuance under equity compensation plans	4,100,000
Stock options
Share-based compensation
Granted (in shares)		426,380
Per-share weighted-average fair value of the stock options granted (in dollars per share) | $ / shares		$ 6.43
Pricing model used for share-based compensation arrangement		binomial lattice
Dividend yield (as a percent)		0.00%
Risk-free interest rate (as a percent)		2.20%
Expected option life		4 years 6 months
Expected volatility (as a percent)		40.00%
Suboptimal exercise multiple | multiple		1.4
Share-based compensation expense | $		$ 2,700	$ 600
Future share-based compensation expense expected | $		$ 17,200
Period for recognition of unrecognized stock-based compensation expense		4 years