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Business combinations (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 | Dec. 31, 2013 | Oct. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |
Purchase price paid in acquisition | $ 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 180,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |
Enterasys Networks, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price paid in acquisition |  |  | $ 180,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | $ 180,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member | $ 180,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = extr_EnterasysNetworksInc.Member

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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