SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)		3 Months Ended		12 Months Ended
	Dec. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) arrangement	Dec. 31, 2015 USD ($) arrangement	Dec. 31, 2014 USD ($) arrangement	Oct. 01, 2016 USD ($)
Intangible Assets and Goodwill
Goodwill		$ 1,924,052,000		$ 1,924,052,000	$ 2,245,364,000	$ 1,754,926,000
Write-down of goodwill				275,367,000	14,056,000	0
Advertising Costs
Advertising expense				$ 1,000,000,000	$ 1,200,000,000	$ 994,700,000
Amortization period for capitalized access fees (in months)				18 months
Redeemable Noncontrolling Interest
Number of put and call arrangements that became exercisable | arrangement				1	2	0
Accounting Pronouncements Adopted
Debt issuance costs		15,766,000		$ 15,766,000
Accounting Standards Update 2015-03 | Other non-current assets
Accounting Pronouncements Adopted
Debt issuance costs					$ (21,300,000)
Accounting Standards Update 2015-03 | Long-term debt
Accounting Pronouncements Adopted
Debt issuance costs					21,300,000
Redeemable Noncontrolling Interests
Redeemable Noncontrolling Interest
Adjustment of redeemable noncontrolling interests and noncontrolling interests to fair value				7,921,000	23,155,000	$ 27,750,000
Nonoperating Income (Expense)
Foreign Currency Translation and Transaction Gains and Losses
Translation gains and losses related to foreign entities					2,200,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | ShoeBuy
Intangible Assets and Goodwill
Gain on sale of business	$ 37,500,000	37,500,000
Write-down of goodwill					14,100,000
Publishing
Intangible Assets and Goodwill
Goodwill		0		0	277,192,000	0
Write-down of goodwill				275,367,000	0
Applications
Intangible Assets and Goodwill
Goodwill		447,242,000		447,242,000	447,242,000	0
Write-down of goodwill				0	0
Other
Intangible Assets and Goodwill
Goodwill		0		0	61,980,000	$ 21,719,000
Write-down of goodwill				0	14,056,000
Operating Segments
Intangible Assets and Goodwill
Excess of goodwill over carrying value, more than (as percent)							20.00%
Operating Segments | Publishing
Intangible Assets and Goodwill
Goodwill		0		0	277,192,000		$ 0
Write-down of indefinite-lived intangible assets			$ 11,600,000		88,000,000
Write-down of goodwill			$ 275,400,000	275,367,000	0
Operating Segments | Applications
Intangible Assets and Goodwill
Goodwill		447,242,000		447,242,000	447,242,000
Write-down of goodwill				0	0
Operating Segments | Other
Intangible Assets and Goodwill
Goodwill		0		0	61,980,000
Write-down of goodwill				$ 0	14,056,000
Operating Segments | Other | ShoeBuy
Intangible Assets and Goodwill
Write-down of indefinite-lived intangible assets					$ 14,100,000
Goodwill | Minimum
Intangible Assets and Goodwill
Discount rate				10.00%	12.00%
Goodwill | Maximum
Intangible Assets and Goodwill
Discount rate				17.50%	22.00%
Indefinite-lived Intangible Assets | Minimum
Intangible Assets and Goodwill
Discount rate				11.00%	11.00%
Royalty rate				2.00%	1.00%
Indefinite-lived Intangible Assets | Minimum | Trade names
Intangible Assets and Goodwill
Royalty rate				2.00%
Indefinite-lived Intangible Assets | Maximum
Intangible Assets and Goodwill
Discount rate				16.00%	16.00%
Royalty rate				7.00%	9.00%
Indefinite-lived Intangible Assets | Maximum | Trade names
Intangible Assets and Goodwill
Royalty rate				6.00%
Match Group, Inc.
Intangible Assets and Goodwill
Market capitalization							$ 4,800,000,000
Excess of market capitalization over carrying value, more than (as percent)							970.00%
Accounting Pronouncements Adopted
Debt issuance costs		$ 13,434,000		$ 13,434,000	$ 16,610,000