Exploration Stage Company (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended				55 Months Ended
	Oct. 31, 2008	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2009	Apr. 30, 2013
Operating loss since inception	$ (12)	$ (445,945)	$ (1,215,747)	$ (975,613)	$ (2,203,696)	$ (3,531,780)	$ (4,777,291)	$ (981,396)	$ (89,397)	$ (10,355,489)