Financial Instruments - Investment (Details) $ in Thousands	12 Months Ended
	Jun. 30, 2016 USD ($) position	Jun. 30, 2015 USD ($) position	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)
Cash, cash equivalents and short-term investments
Amortized Cost	$ 167,025	$ 143,934
Gross Unrealized Gains	8	6
Gross Unrealized Losses	(23)	(83)
Cash and Cash Equivalents	119,771	79,551	$ 92,346	$ 73,313
Short-term investments	47,239	64,306
Other-than-temporary impairments	0	0
Amortized Cost
Due in 1 year or less	24,091
Due in 1-2 years	23,163
Total Amortized Cost	47,254
Fair Value
Due in 1 year or less	24,091
Due in 1-2 years	23,148
Available-for-sale Securities	47,239
Gross Unrealized Losses
Less Than 12 Months	(3)	(49)
12 Months or Greater	(20)	(34)
Total	(23)	(83)
Estimated Fair Value
Less Than 12 Months	6,325	35,933
12 Months or Greater	23,148	16,384
Total	$ 29,473	$ 52,317
Number of positions held in an unrealized loss position | position	11	23
Other-than-temporary impairments	$ 0	$ 0
U.S. government agencies securities
Gross Unrealized Losses
Less Than 12 Months		(1)
12 Months or Greater	(17)	(13)
Total	(17)	(14)
Estimated Fair Value
Less Than 12 Months		11,004
12 Months or Greater	19,988	10,987
Total	19,988	21,991
Corporate debt securities
Gross Unrealized Losses
Less Than 12 Months	(3)	(45)
12 Months or Greater	(3)	(21)
Total	(6)	(66)
Estimated Fair Value
Less Than 12 Months	6,325	23,428
12 Months or Greater	3,160	5,397
Total	9,485	28,825
Non-U.S. government securities
Gross Unrealized Losses
Less Than 12 Months		(3)
Total		(3)
Estimated Fair Value
Less Than 12 Months		1,501
Total		1,501
Cash.
Cash, cash equivalents and short-term investments
Amortized Cost	95,906	73,444
Cash and Cash Equivalents	95,906	73,444
Level 1
Cash, cash equivalents and short-term investments
Amortized Cost	13,362	6,107
Cash and Cash Equivalents	13,362	6,107
Level 1 | Money market funds
Cash, cash equivalents and short-term investments
Amortized Cost	13,362	6,107
Cash and Cash Equivalents	13,362	6,107
Level 2
Cash, cash equivalents and short-term investments
Amortized Cost	57,757	64,383
Gross Unrealized Gains	8	6
Gross Unrealized Losses	(23)	(83)
Cash and Cash Equivalents	10,503
Short-term investments	47,239	64,306
Level 2 | Commercial paper
Cash, cash equivalents and short-term investments
Amortized Cost	14,704	11,989
Cash and Cash Equivalents	8,938
Short-term investments	5,766	11,989
Level 2 | U.S. government agencies securities
Cash, cash equivalents and short-term investments
Amortized Cost	28,000	21,999
Gross Unrealized Gains	7	6
Gross Unrealized Losses	(17)	(14)
Short-term investments	27,990	21,991
Level 2 | U.S. Treasury securities
Cash, cash equivalents and short-term investments
Amortized Cost	3,997
Gross Unrealized Gains	1
Short-term investments	3,998
Level 2 | Municipal debt securities
Cash, cash equivalents and short-term investments
Amortized Cost	1,565
Cash and Cash Equivalents	1,565
Level 2 | Foreign government bonds
Cash, cash equivalents and short-term investments
Amortized Cost		1,504
Gross Unrealized Losses		(3)
Short-term investments		1,501
Level 2 | Corporate debt securities
Cash, cash equivalents and short-term investments
Amortized Cost	9,491	28,891
Gross Unrealized Losses	(6)	(66)
Short-term investments	$ 9,485	$ 28,825