OTHER CURRENT AND NONCURRENT ASSETS: (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Mar. 31, 2015
Other current assets
Prepaid expenses	$ 23,078	$ 20,684
Assets of non-qualified retirement plan	12,731	14,174
Other miscellaneous assets	109	117
Other current assets	35,918	34,975
Other noncurrent assets
Acquired intangible assets, net	20,594	22,902
Deferred data acquisitions costs	1,836	2,347
Deferred expenses	4,246	5,078
Other miscellaneous noncurrent assets	3,373	2,954
Noncurrent assets	$ 30,049	$ 33,281