Income Taxes (Details) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Nov. 30, 2013	Nov. 30, 2013	May 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, period increase (decrease)	$ 400,000	$ 600,000
Unrecognized tax benefits, decrease in accrued interest	100,000	0
Unrecognized tax benefits could decrease by approximately	600,000	600,000
Balance sheet reclass, change in tax regulations			$ 33,600,000