OTHER CURRENT AND NONCURRENT ASSETS: (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 31, 2015
Other current assets
Prepaid expenses	$ 24,984	$ 20,684
Assets of non-qualified retirement plan	12,752	14,174
Other miscellaneous assets	71	117
Other current assets	37,807	34,975
Other noncurrent assets
Acquired intangible assets, net	20,430	22,902
Deferred data acquisitions costs	1,918	2,347
Deferred expenses	4,395	5,078
Other miscellaneous noncurrent assets	3,471	2,954
Noncurrent assets	$ 30,214	$ 33,281