Balance Sheet Accounts (Components of Gross and Net Intangible Asset Balances) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 198,353	$ 200,366
Accumulated Amortization	128,330	123,274
Net Carrying Amount	$ 70,023	$ 77,092
Developed technology
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	3 years 1 month 6 days	3 years 3 months 18 days
Gross Carrying Amount	$ 117,000	$ 117,000
Accumulated Amortization	63,106	58,299
Net Carrying Amount	$ 53,894	$ 58,701
Customer relationships
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	2 years 9 months 18 days	3 years
Gross Carrying Amount	$ 51,639	$ 51,639
Accumulated Amortization	41,578	40,634
Net Carrying Amount	$ 10,061	$ 11,005
Maintenance contracts
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	1 month 6 days	3 months 18 days
Gross Carrying Amount	$ 17,000	$ 17,000
Accumulated Amortization	16,717	15,866
Net Carrying Amount	$ 283	$ 1,134
Trade names
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	3 years 2 months 12 days	3 years 4 months 24 days
Gross Carrying Amount	$ 9,100	$ 9,100
Accumulated Amortization	4,506	4,141
Net Carrying Amount	$ 4,594	$ 4,959
Backlogs
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period		0 years
Gross Carrying Amount		$ 1,800
Accumulated Amortization		$ 1,800
License agreements
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	7 years 3 months 18 days	5 years 9 months 18 days
Gross Carrying Amount	$ 2,232	$ 2,445
Accumulated Amortization	1,244	1,390
Net Carrying Amount	$ 988	$ 1,055
Other intangibles
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Amortization Period	1 year 3 months 18 days	1 year 7 months 6 days
Gross Carrying Amount	$ 1,382	$ 1,382
Accumulated Amortization	1,179	1,144
Net Carrying Amount	$ 203	$ 238