OTHER CURRENT AND NONCURRENT ASSETS: (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012
Other current assets
Prepaid expenses	$ 38,822	$ 43,768
Assets of non-qualified retirement plan	13,394	13,344
Other miscellaneous assets	534	692
Total other current assets	52,750	57,804
Other noncurrent assets
Acquired intangible assets, net	665	1,525
Other miscellaneous noncurrent assets	2,166	2,172
Other assets	$ 2,831	$ 3,697