OTHER CURRENT AND NONCURRENT ASSETS: (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Other current assets
Prepaid expenses	$ 42,470	$ 45,032
Assets of non-qualified retirement plan	13,374	13,771
Other miscellaneous assets	111	132
Total other current assets	55,955	58,935
Other noncurrent assets
Acquired intangible assets, net	467	564
Deferred income tax asset	7,040	7,099
Other miscellaneous noncurrent assets	5,361	5,389
Noncurrent assets	$ 12,868	$ 13,052