Common Stock Options and Warrants (Detail) - Information about stock options (USD $)	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Weighted Average Number Outstanding	$ 0.17	$ 0.25	$ 0.25
Weighted Average Exercise Price, Options Outstanding (in Shares)	10,250,000	13,450,000	15,000,000
Weighted Average Number Exercisable (in Shares)	10,250,000
Weighted Average Exercise Price, Options Exercisable	$ 0.17
Range Of Price 0.05 [Member]
Weighted Average Number Outstanding	$ 0.05
Weighted Average Exercise Price, Options Outstanding (in Shares)	2,000,000
Weighted Average Number Exercisable (in Shares)	2,000,000
Weighted Average Exercise Price, Options Exercisable	$ 0.05
Range Of Price 0.06 [Member]
Weighted Average Number Outstanding	$ 0.06
Weighted Average Exercise Price, Options Outstanding (in Shares)	5,650,000
Weighted Average Number Exercisable (in Shares)	3,150,000
Weighted Average Exercise Price, Options Exercisable	$ 0.06
Range Of Price 0.08 [Member]
Weighted Average Number Outstanding	$ 0.08
Weighted Average Exercise Price, Options Outstanding (in Shares)	500,000
Weighted Average Number Exercisable (in Shares)	500,000
Weighted Average Exercise Price, Options Exercisable	$ 0.08
Range Of Price 0.30 [Member]
Weighted Average Number Outstanding	$ 0.30
Weighted Average Exercise Price, Options Outstanding (in Shares)	100,000
Weighted Average Number Exercisable (in Shares)	100,000
Weighted Average Exercise Price, Options Exercisable	$ 0.30
Range Of Price 0.60 [Member]
Weighted Average Number Outstanding	$ 0.60
Weighted Average Exercise Price, Options Outstanding (in Shares)	2,000,000
Weighted Average Number Exercisable (in Shares)	2,000,000
Weighted Average Exercise Price, Options Exercisable	$ 0.60