OTHER CURRENT AND NONCURRENT ASSETS: (Details) (USD $)	3 Months Ended	9 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Mar. 31, 2013
Other current assets
Prepaid expenses	$ 38,497,000	$ 38,497,000	$ 45,032,000
Assets of non-qualified retirement plan	14,606,000	14,606,000	13,771,000
Other miscellaneous assets	302,000	302,000	132,000
Total other current assets	53,405,000	53,405,000	58,935,000
Other noncurrent assets
Acquired intangible assets, net	338,000	338,000	564,000
Deferred income tax asset	7,696,000	7,696,000	7,099,000
Other miscellaneous noncurrent assets	3,901,000	3,901,000	5,389,000
Noncurrent assets	11,935,000	11,935,000	13,052,000
Distribution from the sale of partnership's real property	3,600,000	3,633,000
Reduction in the carrying value of investment in the partnership	1,000,000
Other, net
Gain associated with the disposition of partnership's real property	$ 2,600,000