Goodwill and Purchased Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Changes in the carrying amount of goodwill
Balance at the beginning of the period	$ 57,848	$ 58,054
Currency translation	(36)	(206)
Balance at the end of the period	57,812	57,848	$ 58,054
Impairment of goodwill	0	0	0
Gross Carrying Amount	47,700	46,743
Accumulated Amortization	(46,736)	(39,132)
Net Amount	964	7,611
Amortization expense	7,700	8,000	$ 7,900
Estimated future amortization expense of purchased intangible assets
2018	143
2019	143
2020	143
2021	143
2022	143
There after	249
Net Amount	$ 964	7,611
Minimum
Changes in the carrying amount of goodwill
Useful Lives	1 year
Maximum
Changes in the carrying amount of goodwill
Useful Lives	7 years
Developed technology
Changes in the carrying amount of goodwill
Gross Carrying Amount	$ 46,700	46,743
Accumulated Amortization	$ (46,700)	(39,132)
Net Amount		7,611
Estimated future amortization expense of purchased intangible assets
Net Amount		$ 7,611
Developed technology | Minimum
Changes in the carrying amount of goodwill
Useful Lives	5 years	5 years
Developed technology | Maximum
Changes in the carrying amount of goodwill
Useful Lives	6 years	6 years
Patent license
Changes in the carrying amount of goodwill
Useful Lives	7 years	7 years
Gross Carrying Amount	$ 1,000
Accumulated Amortization	(36)
Net Amount	964
Estimated future amortization expense of purchased intangible assets
Net Amount	$ 964