SEGMENT INFORMATION: (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues:
Total revenues	$ 217,267	$ 207,345	$ 432,068	$ 404,240
Gross profit:
Total gross profit	97,162	86,033	189,144	165,219
Income (loss) from operations:
Income (loss) from operations	7,120	(2,056)	15,282	(4,925)
Gains, losses and other items, net	300	2,504	614	3,311
Impairment of goodwill and other assets		729		729
Depreciation and amortization:
Depreciation and amortization			41,150	42,410
Operating segment
Revenues:
Total revenues	217,267	207,345	432,068	404,240
Gross profit:
Total gross profit	102,321	90,214	199,274	175,025
Income (loss) from operations:
Income (loss) from operations	51,472	42,030	97,004	82,179
Operating segment | Marketing Services
Revenues:
Total revenues	105,679	112,979	215,394	220,705
Gross profit:
Total gross profit	34,480	37,545	71,946	73,579
Income (loss) from operations:
Income (loss) from operations	19,837	17,908	39,982	34,761
Operating segment | Audience Solutions
Revenues:
Total revenues	78,526	72,122	152,270	140,672
Gross profit:
Total gross profit	47,998	39,170	89,910	75,994
Income (loss) from operations:
Income (loss) from operations	29,972	25,190	55,068	49,277
Operating segment | Connectivity
Revenues:
Total revenues	33,062	22,244	64,404	42,863
Gross profit:
Total gross profit	19,843	13,499	37,418	25,452
Income (loss) from operations:
Income (loss) from operations	1,663	(1,068)	1,954	(1,859)
Reconciling items
Gross profit:
Purchased intangible asset amortization	3,890	3,754	7,967	7,508
Non-cash stock compensation	1,269	349	2,163	778
Accelerated amortization		78		1,520
Income (loss) from operations:
Corporate expenses (principally general and administrative)	26,769	23,563	51,158	49,041
Separation and transformation costs included in general and administrative	1,455	6,098	1,455	9,512
Gains, losses and other items, net	300	2,504	614	3,311
Purchased intangible asset amortization	3,890	3,754	7,967	7,508
Non-cash stock compensation	$ 11,938	7,360	$ 20,528	15,483
Accelerated amortization		$ 78		$ 1,520