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Balance Sheet Components (Narratives) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Balance Sheet Related Disclosures [Abstract] |  |  |
Depreciation expense recognized related to property and equipment | $ 19.8 | $ 23.0 | $ 28.6

X
- Definition Depreciation expense excluding depreciation of royalty assets. + References No definition available. + Details
Name: | extr_DepreciationExpenseExcludingDepreciationOfRoyaltyAssets
Namespace Prefix: | extr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_BalanceSheetRelatedDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration