XML 26 R29.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Balance Sheet Accounts (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Jun. 30, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 21,285 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 33,145 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value | 21,285 us-gaap_AvailableForSaleSecurities | 33,259 us-gaap_AvailableForSaleSecurities
Unrealized Holding Gains | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInvestments | 114 extr_AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInvestments
Unrealized Holding Losses | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments
Cash equivalents |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 19,779 us-gaap_AvailableForSaleSecuritiesAmortizedCost / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_CashEquivalentsMember | 567 us-gaap_AvailableForSaleSecuritiesAmortizedCost / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_CashEquivalentsMember
Fair Value | 19,779 us-gaap_AvailableForSaleSecurities / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_CashEquivalentsMember | 567 us-gaap_AvailableForSaleSecurities / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_CashEquivalentsMember
Unrealized Holding Gains | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInvestments / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_CashEquivalentsMember | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInvestments / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_CashEquivalentsMember
Unrealized Holding Losses | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_CashEquivalentsMember | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_CashEquivalentsMember
Short-term investments |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,506 us-gaap_AvailableForSaleSecuritiesAmortizedCost / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember | 32,578 us-gaap_AvailableForSaleSecuritiesAmortizedCost / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Fair Value | 1,506 us-gaap_AvailableForSaleSecurities / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember | 32,692 us-gaap_AvailableForSaleSecurities / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Unrealized Holding Gains |  | 114 extr_AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInvestments / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Unrealized Holding Losses | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments / extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 19,779 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember | 567 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
Fair Value | 19,779 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember | 567 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
Unrealized Holding Gains | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
Unrealized Holding Losses | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember | 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
U.S. corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,506 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DomesticCorporateDebtSecuritiesMember | 32,578 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DomesticCorporateDebtSecuritiesMember
Fair Value | 1,506 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DomesticCorporateDebtSecuritiesMember | 32,692 us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DomesticCorporateDebtSecuritiesMember
Unrealized Holding Gains |  | 114 extr_AvailableforsaleSecuritiesGrossUnrealizedGainAccumulatedInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DomesticCorporateDebtSecuritiesMember
Unrealized Holding Losses | $ 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DomesticCorporateDebtSecuritiesMember | $ 0 extr_AvailableforsaleSecuritiesGrossUnrealizedLossAccumulatedInvestments / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DomesticCorporateDebtSecuritiesMember

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

X
- Details
Name: | extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis=us-gaap_CashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | extr_ScheduleOfAvailableForSaleSecuritiesByMajorCategoryOfInvestmentAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_DomesticCorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |