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FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details) (USD $)
Mar. 31, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2013
Fair Value Disclosures [Abstract]        
Deposits of cash outside the United States $ 392,300,000ubnt_DepositsOfCashOutsideDomesticCountry      
Cash and cash equivalents $ 451,159,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 347,097,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 291,670,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 227,826,000us-gaap_CashAndCashEquivalentsAtCarryingValue