XML 58 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Balance Sheet Accounts (Components of Gross and Net Intangible Asset Balances) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 167,027 | $ 121,627
Accumulated Amortization | 101,999 | 97,690
Net Carrying Amount | 65,028 | 23,937
Gross Carrying Amount, Intangibles | 169,327 | 123,027
Net Carrying Amount, Intangibles | 67,328 | 25,337
In-process research and development, with indefinite life |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Fair value of indefinite lived intangibles | $ 2,300 | $ 1,400
Developed technology |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period | 5 years 3 months 19 days | 5 years 3 months 19 days
Gross Carrying Amount | $ 91,600 | $ 55,400
Accumulated Amortization | 44,395 | 42,689
Net Carrying Amount | $ 47,205 | $ 12,711
Customer relationships |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period | 2 years 10 months 25 days | 3 years 3 months 19 days
Gross Carrying Amount | $ 45,600 | $ 40,300
Accumulated Amortization | 38,051 | 37,567
Net Carrying Amount | $ 7,549 | $ 2,733
Maintenance contracts |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period | 1 year 1 month 7 days | 1 year 3 months 19 days
Gross Carrying Amount | $ 17,000 | $ 17,000
Accumulated Amortization | 13,317 | 12,467
Net Carrying Amount | $ 3,683 | $ 4,533
Trademarks |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period | 4 years 8 months 13 days | 4 years 3 months 19 days
Gross Carrying Amount | $ 7,500 | $ 5,100
Accumulated Amortization | 3,057 | 2,846
Net Carrying Amount | $ 4,443 | $ 2,254
Backlogs |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period | 2 months 13 days |
Gross Carrying Amount | $ 1,500 |
Accumulated Amortization | 892 |
Net Carrying Amount | $ 608 |
License agreements |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period | 6 years 2 months 13 days | 6 years 4 months 25 days
Gross Carrying Amount | $ 2,445 | $ 2,445
Accumulated Amortization | 1,187 | 1,120
Net Carrying Amount | $ 1,258 | $ 1,325
Other intangibles |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |
Weighted Average Remaining Amortization Period | 2 years 4 months 25 days | 2 years 8 months 13 days
Gross Carrying Amount | $ 1,382 | $ 1,382
Accumulated Amortization | 1,100 | 1,001
Net Carrying Amount | $ 282 | $ 381

X
- Definition Finite and indefinite lived intangible assets. + References No definition available. + Details
Name: | extr_FiniteAndIndefiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | extr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Finite-Lived Intangible Assets, Weighted Average Remaining Amortization Period + References No definition available. + Details
Name: | extr_FiniteLivedIntangibleAssetsWeightedAverageRemainingAmortizationPeriod
Namespace Prefix: | extr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before accumulated amortization of intangible assets, excluding goodwill. + References No definition available. + Details
Name: | us-gaap_IntangibleAssetsGrossExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
Name: | us-gaap_IntangibleAssetsNetExcludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis=extr_InProcessResearchAndDevelopmentIndefiniteLivedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_DevelopedTechnologyRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=extr_MaintenanceContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OrderOrProductionBacklogMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LicensingAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OtherIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |