OTHER CURRENT AND NONCURRENT ASSETS: (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 31, 2015
Other current assets
Prepaid expenses	$ 22,205	$ 20,684
Assets of non-qualified retirement plan	14,815	14,174
Other miscellaneous assets	167	117
Other current assets	37,187	34,975
Other noncurrent assets
Acquired intangible assets, net	21,666	22,902
Deferred data acquisitions costs	2,404	2,347
Deferred expenses	4,773	5,078
Other miscellaneous noncurrent assets	2,352	2,954
Noncurrent assets	$ 31,195	$ 33,281