Financial Instruments (Tables)

9 Months Ended

Mar. 31, 2015

Financial Instruments

Summary of amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category for cash, cash equivalents and short-term investments

The following tables summarize the amortized cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category for cash, cash equivalents and short-term investments (in thousands):

	March 31, 2015
								Estimated Market Value
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Cash and Cash Equivalents		Short-term Investments
Cash	$	79,192	$	—	$	—		$	79,192	$	—
Level 1
Money market funds	8,258		—		—			8,258		—
	8,258		—		—			8,258		—
Level 2
Commercial paper	15,997		—		—			7,999		7,998
U.S. Agency securities	17,999		1		—			—		18,000
Non-U.S. government securities	1,507		—		(4		)	—		1,503
Corporate notes	26,749		—		(65		)	—		26,684
	62,252		—		(69		)	7,999		54,185
Total	$	149,702	$	1	$	(69	)	$	95,449	$	54,185

	June 30, 2014
								Estimated Market Value
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Cash and Cash Equivalents		Short-term Investments
Cash	$	91,797	$	—	$	—		$	91,797	$	—
Level 1
Money market funds	549		—		—			549		—
Level 2
Corporate notes	79,535		72		(54		)	—		79,553
Total	$	171,881	$	72	$	(54	)	$	92,346	$	79,553

Schedule of contractual maturities of available-for-sale securities

Contractual maturities of available-for-sale securities at March 31, 2015 were as follows (in thousands):

	March 31, 2015
	Amortized Cost		Fair Value
Due in 1 year or less	$	40,421	$	40,381
Due in 1-2 years	8,487		8,469
Due in 2-3 years	5,345		5,335
	$	54,253	$	54,185

Schedule of carrying values and estimated fair values of long-term debt that are measured on a non-recurring basis

The following table summarizes the carrying values and estimated fair values of our long-term debt (in thousands):

	March 31, 2015				June 30, 2014
	Carrying Value		Fair Value		Carrying Value		Fair Value
3.75% Convertible Notes	$	92,390	$	111,580	$	88,511	$	115,415
3.50% Convertible Notes	44,654		79,163		44,654		79,388
3.50% Series A Convertible Notes	63,945		124,709		62,447		125,065
Total	$	200,989	$	315,452	$	195,612	$	319,868