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GOODWILL: (Details) (USD $)	12 Months Ended		3 Months Ended
GOODWILL: (Details) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2013
Goodwill information
Impairment of goodwill and other		$ 24,953,000us-gaap_AssetImpairmentCharges
Goodwill
Goodwill at the beginning of the period	358,384,000us-gaap_Goodwill	381,129,000us-gaap_Goodwill
Goodwill impairment	0us-gaap_GoodwillImpairmentLoss	(23,313,000)us-gaap_GoodwillImpairmentLoss
Acquisition	213,093,000us-gaap_GoodwillAcquiredDuringPeriod	350,000us-gaap_GoodwillAcquiredDuringPeriod
Change in foreign currency translation adjustment	(2,607,000)us-gaap_GoodwillTranslationAdjustments	218,000us-gaap_GoodwillTranslationAdjustments
Goodwill at the end of the period	568,870,000us-gaap_Goodwill	358,384,000us-gaap_Goodwill	358,384,000us-gaap_Goodwill
Accumulated impairment losses	114,200,000	114,200,000	114,200,000
Marketing and Data Services
Goodwill
Goodwill at the beginning of the period	286,876,000	306,854,000
Goodwill impairment		(20,283,000)
Acquisition	213,093,000	350,000
Change in foreign currency translation adjustment	(2,607,000)	(45,000)
Goodwill at the end of the period	497,362,000	286,876,000	286,876,000
Marketing and Data Services \| United States
Goodwill
Goodwill at the end of the period	479,900,000
Marketing and Data Services \| Australia
Goodwill
Goodwill at the end of the period	10,900,000
Marketing and Data Services \| Asia
Goodwill
Goodwill at the end of the period	6,000,000
Marketing and Data Services \| Brazil
Goodwill
Goodwill at the end of the period	600,000
IT Infrastructure Management
Goodwill
Goodwill at the beginning of the period				71,508,000
Goodwill at the end of the period	71,508,000	71,508,000	71,508,000	71,508,000
Other services
Goodwill information
Impairment charges			900,000
Goodwill
Goodwill at the beginning of the period		2,767,000
Goodwill impairment		(3,030,000)	(3,000,000)
Change in foreign currency translation adjustment		$ 263,000