OTHER CURRENT AND NONCURRENT ASSETS: (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017
Other current assets
Prepaid expenses and other	$ 21,321	$ 25,714
Escrow deposit	5,880	5,880
Note receivable	4,000	4,000
Assets of non-qualified retirement plan	13,608	12,716
Other current assets	44,809	48,310
Other noncurrent assets
Acquired intangible assets, net	41,337	43,884
Deferred data acquisition costs	1,073	1,116
Other miscellaneous noncurrent assets	5,769	6,443
Noncurrent assets	$ 48,179	$ 51,443