Legal Proceedings and Contingencies - Additional Information (Detail) (Australia and New Zealand Discontinued Operations [Member], USD $)	3 Months Ended	35 Months Ended
	Nov. 30, 2012	Nov. 30, 2012	Aug. 31, 2012
Australia and New Zealand Discontinued Operations [Member]
Loss Contingencies [Line Items]
Cash	$ 100,000	$ 100,000
Other net assets	600,000	600,000
Amount of proceeds in escrow	2,000,000
Number of equal installment payments release of escrow (in number of payments)	4
Escrowed payments received		1,225,000
Remaining escrowed payments	775,000	775,000
Amount of claim filed by the purchaser of Company's Lane cave			901,000
Amount of issued written decision to award purchaser	143,000
Amount of allowance established to cover arbitrator's award and other cost	$ 163,000	$ 163,000