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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Product Warranties (Details) | 12 Months Ended
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Jun. 30, 2017
Accounting Policies [Abstract] |
Warranty period | 1 year
Period of warranty effective from date of purchase | 12 months

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- Definition Standard Period Of Warranty, Effective From Date Of Purchase + References No definition available. + Details
Name: | ubnt_StandardPeriodOfWarrantyEffectiveFromDateOfPurchase
Namespace Prefix: | ubnt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Standard product warranty period. + References No definition available. + Details
Name: | ubnt_StandardProductWarrantyPeriod
Namespace Prefix: | ubnt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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