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Acquisition - Additional Information (Detail) (USD $)	1 Months Ended		9 Months Ended	112 Months Ended
Acquisition - Additional Information (Detail) (USD $)	Feb. 28, 2013	Oct. 31, 2012	Feb. 28, 2013	Feb. 28, 2013
Business Acquisition [Line Items]
Asset purchase, cash paid		$ 3,500,000
Intangible asset acquired	$ 3,500,000		$ 3,500,000	$ 3,500,000

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

The cash outflow for acquisition of or capital improvements on other tangible or intangible assets not otherwise defined in the taxonomy.