DEBT - Summary of Debt and Interest Payment Obligations (Details) $ in Thousands	Jun. 30, 2017 USD ($)
Debt Disclosure [Abstract]
Debt payment obligations, 2018	$ 15,000
Interest payments on debt payment obligations, 2018	7,044
Total, 2018	22,044
Debt payment obligations, 2019	15,000
Interest payments on debt payment obligations, 2019	6,642
Total, 2019	21,642
Debt payment obligations, 2020	227,250
Interest payments on debt payment obligations, 2020	4,314
Total, 2020	231,564
Debt payment obligations, 2021	0
Interest payments on debt payment obligations, 2021	0
Total, 2021	0
Debt payment obligations, 2022	0
Interest payments on debt payment obligations, 2022	0
Total, 2022	0
Debt payment obligation, Thereafter	0
Interest payments on debt payment obligations, Thereafter	0
Total, Thereafter	0
Long-term debt	257,250
Long term debt maturities repayments of interest	18,000
Long term debt maturities repayments of principal and interest	$ 275,250

Long Term Debt Maturities Repayments Of Interest

No definition available.

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfInterest
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Interest After Year Five

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfInterestAfterYearFive
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt, Maturities, Repayments Of Interest In Next Twelve Months

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfInterestInNextTwelveMonths
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Interest In Year Five

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfInterestInYearFive
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Interest In Year Four

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfInterestInYearFour
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Interest In Year Three

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfInterestInYearThree
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Interest In Year Two

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfInterestInYearTwo
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Principal And Interest

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterest
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Principal And Interest After Year Five

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestAfterYearFive
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt, Maturities, Repayments Of Principal And Interest In Next Twelve Months

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestInNextTwelveMonths
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Principal And Interest In Year Five

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestInYearFive
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Principal And Interest In Year Four

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestInYearFour
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Principal And Interest In Year Three

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestInYearThree
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Long Term Debt Maturities Repayments Of Principal And Interest In Year Two

+ References

No definition available.

+ Details

Name:	ubnt_LongTermDebtMaturitiesRepaymentsOfPrincipalAndInterestInYearTwo
Namespace Prefix:	ubnt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant