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DEBT - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Mar. 03, 2015
Mar. 31, 2015
Jun. 30, 2014
Aug. 07, 2012
May 05, 2014
Debt Disclosure [Line Items]              
Short-term debt       $ 10,000,000us-gaap_ShortTermBorrowings $ 0us-gaap_ShortTermBorrowings    
Long-term debt       90,000,000us-gaap_LongTermDebtNoncurrent 72,254,000us-gaap_LongTermDebtNoncurrent    
Revolving credit facility              
Debt Disclosure [Line Items]              
Revolving credit facility           50,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Sublimit for letters of credit              
Debt Disclosure [Line Items]              
Revolving credit facility           5,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
 
Sublimit for swingline loan advances              
Debt Disclosure [Line Items]              
Revolving credit facility           5,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ubnt_SwinglineLoanMember
 
Term loan facility              
Debt Disclosure [Line Items]              
Revolving credit facility           50,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ubnt_TermLoanMember
 
Original Credit Agreement              
Debt Disclosure [Line Items]              
Aggregate payments 1,300,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= ubnt_OriginalCreditAgreementMember
3,800,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_DebtInstrumentAxis
= ubnt_OriginalCreditAgreementMember
         
Original Credit Agreement | Revolving credit facility              
Debt Disclosure [Line Items]              
Revolving credit facility             150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_OriginalCreditAgreementMember
Additional borrowing capacity             50,000,000ubnt_LineofCreditFacilityOptionAdditionalMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_OriginalCreditAgreementMember
Original Credit Agreement | Sublimit for letters of credit              
Debt Disclosure [Line Items]              
Revolving credit facility             10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ubnt_OriginalCreditAgreementMember
Original Credit Agreement | Sublimit for swingline loan advances              
Debt Disclosure [Line Items]              
Revolving credit facility             25,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ubnt_SwinglineLoanMember
/ us-gaap_DebtInstrumentAxis
= ubnt_OriginalCreditAgreementMember
Original Credit Agreement | Term loan facility              
Debt Disclosure [Line Items]              
Repayment of outstanding balance     72,300,000us-gaap_RepaymentsOfLongTermLinesOfCredit
/ us-gaap_CreditFacilityAxis
= ubnt_TermLoanMember
/ us-gaap_DebtInstrumentAxis
= ubnt_OriginalCreditAgreementMember
       
Amended Credit Agreement | Revolving credit facility              
Debt Disclosure [Line Items]              
Revolving credit facility     200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
       
Additional borrowing capacity     50,000,000ubnt_LineofCreditFacilityOptionAdditionalMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
       
Issuance fees per annum     0.125%ubnt_LineofCreditFacilityDebtIssuanceCostsPercentageAnnually
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
       
Minimum liquidity to satisfy covenant terms     225,000,000ubnt_LineofCreditFacilityCovenantTermsMinimumLiquidity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
       
Minimum liquidity after increase in borrowings     250,000,000ubnt_LineofCreditFacilityCovenantTermsMinimumLiquidityAmountAfterIncreaseinBorrowings
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
       
Availability of revolving credit facility to satisfy covenant term     50,000,000ubnt_LineofCreditFacilityCovenantTermsMinimumAvailableBorrowingstoSatisfyCovenant
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
       
Amended Credit Agreement | Revolving credit facility | Minimum              
Debt Disclosure [Line Items]              
Commitment fee percentage of unused borrowings     0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Maximum leverage ratio     1.00us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Amended Credit Agreement | Revolving credit facility | Maximum              
Debt Disclosure [Line Items]              
Commitment fee percentage of unused borrowings     0.35%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Maximum leverage ratio     2.50us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Amended Credit Agreement | Sublimit for letters of credit | Minimum              
Debt Disclosure [Line Items]              
Commitment fee percentage of unused borrowings     1.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
       
Amended Credit Agreement | Sublimit for letters of credit | Maximum              
Debt Disclosure [Line Items]              
Commitment fee percentage of unused borrowings     2.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
       
Amended Credit Agreement | Term loan facility              
Debt Disclosure [Line Items]              
Revolving credit facility     $ 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= ubnt_TermLoanMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
       
Amended Credit Agreement | Base rate | Revolving credit facility | Minimum              
Debt Disclosure [Line Items]              
Debt basis spread on variable rate     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
       
Amended Credit Agreement | Base rate | Revolving credit facility | Maximum              
Debt Disclosure [Line Items]              
Debt basis spread on variable rate     1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
       
Amended Credit Agreement | Base rate | Sublimit for swingline loan advances | Minimum              
Debt Disclosure [Line Items]              
Debt basis spread on variable rate     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ubnt_SwinglineLoanMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
       
Amended Credit Agreement | Base rate | Sublimit for swingline loan advances | Maximum              
Debt Disclosure [Line Items]              
Debt basis spread on variable rate     1.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= ubnt_SwinglineLoanMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
       
Amended Credit Agreement | Federal funds rate | Revolving credit facility              
Debt Disclosure [Line Items]              
Debt basis spread on variable rate     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_VariableRateAxis
= us-gaap_FederalFundsEffectiveSwapRateMember
       
Amended Credit Agreement | LIBOR | Revolving credit facility              
Debt Disclosure [Line Items]              
Debt basis spread on variable rate     1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Amended Credit Agreement | LIBOR | Revolving credit facility | Minimum              
Debt Disclosure [Line Items]              
Debt basis spread on variable rate     1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Amended Credit Agreement | LIBOR | Revolving credit facility | Maximum              
Debt Disclosure [Line Items]              
Debt basis spread on variable rate     2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Amended Credit Agreement | Applicable interest rate | Revolving credit facility              
Debt Disclosure [Line Items]              
Debt basis spread over applicable interest rate     2.00%ubnt_DebtInstrumentDebtDefaultBasisSpreadOverApplicableInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ us-gaap_VariableRateAxis
= ubnt_ApplicableInterestRateMember
       
Quarterly installments through March 31, 2017 | Amended Credit Agreement | Term loan facility              
Debt Disclosure [Line Items]              
Percentage of principal due quarterly     2.50%ubnt_LineofCreditFacilityPeriodicPaymentPrincipalPercentage
/ us-gaap_CreditFacilityAxis
= ubnt_TermLoanMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ ubnt_RepaymentPeriodAxis
= ubnt_QuarterlyInstallmentsPeriod1Member
       
Quarterly installments after March 31, 2017 through maturity | Amended Credit Agreement | Term loan facility              
Debt Disclosure [Line Items]              
Percentage of principal due quarterly     3.75%ubnt_LineofCreditFacilityPeriodicPaymentPrincipalPercentage
/ us-gaap_CreditFacilityAxis
= ubnt_TermLoanMember
/ us-gaap_DebtInstrumentAxis
= ubnt_AmendedCreditAgreementMember
/ ubnt_RepaymentPeriodAxis
= ubnt_QuarterlyInstallmentsPeriod2Member