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BALANCE SHEET COMPONENTS - Prepaid Expenses and Other Current Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Balance Sheet Related Disclosures [Abstract]    
Vendor deposits $ 25,850ubnt_VendorDepositsCurrent $ 8,043ubnt_VendorDepositsCurrent
Other current assets 4,366us-gaap_OtherAssetsCurrent 5,224us-gaap_OtherAssetsCurrent
Prepaid expenses and other current assets $ 30,216us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 13,267us-gaap_PrepaidExpenseAndOtherAssetsCurrent