OTHER CURRENT AND NONCURRENT ASSETS: (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Mar. 31, 2016
Other current assets
Prepaid expenses	$ 25,712	$ 25,365
Escrow deposit (see note 4)	5,880
Note receivable (see note 5)	4,000
Assets of non-qualified retirement plan	12,443	12,532
Other current assets	48,035	37,897
Other noncurrent assets
Acquired intangible assets, net	47,522	19,203
Deferred data acquisitions costs	998	1,644
Other miscellaneous noncurrent assets	3,901	4,468
Noncurrent assets	$ 52,421	$ 25,315