Debt (Details) (USD $)	3 Months Ended	9 Months Ended		0 Months Ended	1 Months Ended		0 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Aug. 01, 2011	Apr. 30, 2014	Feb. 28, 2013	Apr. 17, 2014	Mar. 31, 2015	Jun. 30, 2014	Aug. 02, 2011
Debt
Principal amount of the Notes		$ 215,000,000						$ 215,000,000
Carrying amount of the equity conversion component		31,033,000						31,033,000
Unamortized debt discount		(14,011,000)						(14,011,000)
Net carrying amount		200,989,000						200,989,000	195,612,000
Interest expense related to contractual interest coupon	1,943,000	5,832,000
Interest expense related to amortization of debt discount	1,205,000	5,377,000
Interest expense related to amortization of debt issuance costs	361,000	1,114,000	1,053,000
Total interest expense recognized	3,509,000	12,323,000
3.75% Convertible Notes
Debt
Aggregate principal amount of debt issued				100,000,000
Interest rate (as a percent)		3.75%		3.75%				3.75%		3.75%
Principal amount of the Notes		100,000,000						100,000,000
Proceeds from debt, net of costs				96,100,000
Debt issuance costs, amortization period				5 years
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)		105.5548
Principal amount used for debt instrument conversion ratio		1,000						1,000
Conversion price (in dollars per share)		$ 9.47						$ 9.47
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible into common stock		30 days
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period		5 days
Number of consecutive trading days before five consecutive business days during the note measurement period		5 days
Number of working days preceding maturity date for delivery of shares or payment of cash		33 days
Repurchase price, as percentage of principal amount, if company undergoes change of control		100.00%
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be redeemable		30 days
Discount rate on liability component (as a percent)				10.00%
Debt issuance costs and discount allocated to equity conversion component				900,000
Carrying amount of the equity conversion component		23,189,000		24,100,000				23,189,000
Unamortized debt discount		(7,610,000)						(7,610,000)
Net carrying amount		92,390,000		75,900,000				92,390,000
3.75% Convertible Notes | Minimum
Debt
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be convertible into common stock		20 days
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible		130.00%
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be redeemable		130.00%
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be redeemable		20 days
3.75% Convertible Notes | Maximum
Debt
Percentage of the trading price to the product of the sale price of the entity's common stock and the conversion rate		98.00%
3.50% Convertible Notes
Debt
Aggregate principal amount of debt issued						115,000,000
Interest rate (as a percent)		3.50%				3.50%		3.50%
Principal amount of the Notes		44,654,000						44,654,000
Proceeds from debt, net of costs						110,500,000
Debt issuance costs, amortization period						5 years
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)		187.6877
Principal amount used for debt instrument conversion ratio		1,000						1,000
Conversion price (in dollars per share)		$ 5.33						$ 5.33
Repurchase price, as percentage of principal amount, if company undergoes change of control		100.00%
Net carrying amount		44,654,000						44,654,000
Aggregate principal amount of debt refinanced					70,300,000
Conversion rate, amount of debt to be issued per $1000 of principal amount							1,000
3.50% Series A Convertible Notes
Debt
Aggregate principal amount of debt issued							70,300,000
Interest rate (as a percent)							3.50%
Principal amount of the Notes		70,346,000						70,346,000
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares)		187.6877
Conversion price (in dollars per share)		$ 5.33						$ 5.33
Number of days within 30 consecutive trading days in which the closing price of the entity's common stock must exceed the conversion price for the notes to be convertible into common stock		20 days
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible into common stock		30 days
Percentage of the closing sales price of the entity's common stock that the conversion price must exceed in order for the notes to be convertible		130.00%
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period		5 days
Number of consecutive trading days before five consecutive business days during the note measurement period		5 days
Percentage of the trading price to the product of the sale price of the entity's common stock and the conversion rate		98.00%
Number of working days preceding maturity date for delivery of shares or payment of cash		17 days
Discount rate on liability component (as a percent)		7.00%
Carrying amount of the equity conversion component		7,844,000						7,844,000
Unamortized debt discount		(6,401,000)						(6,401,000)
Net carrying amount		63,945,000						63,945,000
Interest expense related to contractual interest coupon			5,831,000					1,944,000
Interest expense related to amortization of debt discount			3,519,000					1,837,000
Interest expense related to amortization of debt issuance costs			1,053,000					383,000
Total interest expense recognized			10,403,000					4,164,000
Payment to the convertible note holders to modify the notes							400,000
Conversion rate, amount of debt to be issued per $1000 of principal amount		1,000						1,000
Portion of cash amount paid allocated to debt discount		400,000						400,000
Portion of cash amount paid allocated to equity component		$ 47,000,000						$ 47,000,000