Marketable Securities, Eldorado Resorts, Inc.- Fair Value to Amortized Cost Basis (Details) (Eldorado, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Eldorado
Schedule of Equity Method Investments [Line Items]
Net operating revenues	$ 54,477	$ 63,631	$ 173,256	$ 191,638
Operating income	2,449	7,092	10,814	23,617
Net income	$ (751)	$ 3,184	$ (175)	$ 11,819