Commitments - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended	1 Months Ended		3 Months Ended	12 Months Ended
	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Mar. 15, 2011 Executive Vice President	Mar. 15, 2009 Executive Vice President	Oct. 31, 2009 Executive Vice President	Jan. 31, 2009 Executive Vice President
Commitments and Contingencies Disclosure [Line Items]
Officer compensation					$ 8,000
Shares of stock granted for services (in shares)				350,000	350,000		50,000
Issuance of shares for services (in shares)	200,000	300,000	600,000			350,000
Additional restricted shares issuable provided agreement not terminated					350,000