XML 47 R29.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Balance Sheet Accounts (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Jun. 30, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 164,416 | $ 164,363
Fair Value | 164,581 | 164,095
Unrealized Holding Gains | 165 | 126
Unrealized Holding Losses | 0 | (394)
Cash Equivalents |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 68,154 | 54,285
Fair Value | 68,154 | 54,285
Unrealized Holding Gains | 0 | 0
Unrealized Holding Losses | 0 | 0
Short-term Investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 96,262 | 42,994
Fair Value | 96,427 | 43,034
Unrealized Holding Gains | 165 | 44
Unrealized Holding Losses | 0 | (4)
Marketable Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 67,084
Fair Value |  | 66,776
Unrealized Holding Gains |  | 82
Unrealized Holding Losses |  | (390)
Money Market Funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 68,154 | 54,285
Fair Value | 68,154 | 54,285
Unrealized Holding Gains | 0 | 0
Unrealized Holding Losses | 0 | 0
U.S. Corporate Debt Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 96,262 | 110,078
Fair Value | 96,427 | 109,810
Unrealized Holding Gains | 165 | 126
Unrealized Holding Losses | $ 0 | $ (394)

X
- Definition Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
Name: | extr_AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInvestments
Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. + References No definition available. + Details
Name: | extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments
Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration