OTHER CURRENT AND NONCURRENT ASSETS: (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017
Other current assets
Prepaid expenses and other	$ 28,246	$ 25,714
Escrow deposit	0	5,880
Note receivable	0	4,000
Assets of non-qualified retirement plan	14,111	12,716
Other current assets	42,357	48,310
Other noncurrent assets
Acquired intangible assets, net	36,183	43,884
Deferred data acquisition costs	982	1,116
Other miscellaneous noncurrent assets	6,411	6,443
Noncurrent assets	$ 43,576	$ 51,443