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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

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