OTHER CURRENT AND NONCURRENT ASSETS: (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Mar. 31, 2016
Other current assets
Prepaid expenses	$ 26,590	$ 25,365
Note receivable	4,000
Assets of non-qualified retirement plan	12,326	12,532
Other current assets	42,916	37,897
Other noncurrent assets
Acquired intangible assets, net	16,685	19,203
Deferred data acquisitions costs	1,141	1,644
Deferred expenses	745	883
Prepaid expenses	1,400	1,404
Other miscellaneous noncurrent assets	2,036	2,181
Noncurrent assets	$ 22,007	$ 25,315