GOODWILL: (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Goodwill
Goodwill at the beginning of the period		$ 497,362
Impairment		(502)
Change in foreign currency translation adjustment		(1,017)
Goodwill at the end of the period	$ 495,843	495,843
Brazil
Goodwill information
Asset impairment charges	700
Impairment of property and equipment, and other long-lived assets	200
Goodwill
Impairment	500
Marketing services and audience solutions
Goodwill
Goodwill at the beginning of the period		402,645
Impairment		(502)
Change in foreign currency translation adjustment		(832)
Goodwill at the end of the period	401,311	401,311
Marketing services and audience solutions | United States
Goodwill
Goodwill at the end of the period	388,600	388,600
Marketing services and audience solutions | Asia/Pacific
Goodwill
Goodwill at the end of the period	12,700	12,700
Connectivity
Goodwill
Goodwill at the beginning of the period		94,717
Change in foreign currency translation adjustment		(185)
Goodwill at the end of the period	94,532	94,532
Connectivity | United States
Goodwill
Goodwill at the end of the period	91,100	91,100
Connectivity | Asia/Pacific
Goodwill
Goodwill at the end of the period	$ 3,400	$ 3,400