OTHER CURRENT AND NONCURRENT ASSETS: (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Mar. 31, 2013
Other current assets
Prepaid expenses	$ 45,476	$ 45,032
Assets of non-qualified retirement plan	14,131	13,771
Other miscellaneous assets	445	132
Total other current assets	60,052	58,935
Other noncurrent assets
Acquired intangible assets, net	410	564
Deferred income tax asset	7,359	7,099
Other miscellaneous noncurrent assets	5,050	5,389
Noncurrent assets	$ 12,819	$ 13,052