SEGMENT INFORMATION - SCHEDULE OF RECONCILIATION OF SEGMENT ASSETS TO TOTAL ASSETS (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2015 USD ($) segment	Sep. 30, 2015 segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting, Asset Reconciling Item
Segment assets	$ 2,523,758		$ 2,010,023
Goodwill	2,245,364		1,754,926
Indefinite-lived intangible assets	380,137		405,234
Definite-lived intangible assets	60,691		86,702
TOTAL ASSETS	$ 5,209,950		4,256,885
Number of reportable segments | segment	6
Operating Segments
Segment Reporting, Asset Reconciling Item
Goodwill	$ 2,245,364		1,754,926	$ 1,675,323
Operating Segments | Search & Applications
Segment Reporting, Asset Reconciling Item
Segment assets			0
Goodwill	$ 0		774,822	738,062
Indefinite-lived intangible assets			0
Definite-lived intangible assets			0
TOTAL ASSETS			774,822
Number of operating segments | segment		1
Number of reportable segments | segment		1
Number of operating segments after split | segment	3
Number of reportable segments after split | segment	3
Operating Segments | Match Group
Segment Reporting, Asset Reconciling Item
Segment assets	$ 345,879		292,307
Goodwill	1,293,109		791,474	768,080
Indefinite-lived intangible assets	243,697		180,558
Definite-lived intangible assets	32,711		27,055
TOTAL ASSETS	1,915,396		1,291,394
Operating Segments | HomeAdvisor
Segment Reporting, Asset Reconciling Item
Segment assets	32,112		28,975
Goodwill	150,251		151,321	131,872
Indefinite-lived intangible assets	600		600
Definite-lived intangible assets	5,727		9,693
TOTAL ASSETS	188,690		190,589
Operating Segments | Publishing
Segment Reporting, Asset Reconciling Item
Segment assets	390,951		201,405
Goodwill	277,192		0	0
Indefinite-lived intangible assets	59,805		148,095
Definite-lived intangible assets	7,849		25,936
TOTAL ASSETS	735,797		375,436
Operating Segments | Applications
Segment Reporting, Asset Reconciling Item
Segment assets	108,997		117,358
Goodwill	447,242		0	0
Indefinite-lived intangible assets	60,600		60,600
Definite-lived intangible assets	7,964		13,079
TOTAL ASSETS	624,803		191,037
Operating Segments | Video
Segment Reporting, Asset Reconciling Item
Segment assets	90,671		83,233
Goodwill	15,590		15,590	15,590
Indefinite-lived intangible assets	1,800		1,800
Definite-lived intangible assets	3,343		4,900
TOTAL ASSETS	111,404		105,523
Operating Segments | Other
Segment Reporting, Asset Reconciling Item
Segment assets	64,550		53,355
Goodwill	61,980		21,719	$ 21,719
Indefinite-lived intangible assets	13,635		13,581
Definite-lived intangible assets	3,097		6,039
TOTAL ASSETS	143,262		94,694
Corporate
Segment Reporting, Asset Reconciling Item
Segment assets	1,490,598		1,233,390
Goodwill	0		0
Indefinite-lived intangible assets	0		0
Definite-lived intangible assets	0		0
TOTAL ASSETS	$ 1,490,598		$ 1,233,390