Schedule of Available-for-sale Securities (Details) (USD $)	9 Months Ended	12 Months Ended
	Apr. 30, 2013	Jul. 31, 2012
Available-for-sale Securities Schedule Of Available-for-sale Securities 1	$ 3,871
Available-for-sale Securities Schedule Of Available-for-sale Securities 2	0
Available-for-sale Securities Schedule Of Available-for-sale Securities 3	0
Available-for-sale Securities Schedule Of Available-for-sale Securities 4	33,709
Available-for-sale Securities Schedule Of Available-for-sale Securities 5	0
Available-for-sale Securities Schedule Of Available-for-sale Securities 6	0
Available-for-sale Securities Schedule Of Available-for-sale Securities 7	37,580
Available-for-sale Securities Schedule Of Available-for-sale Securities 8	0
Available-for-sale Securities Schedule Of Available-for-sale Securities 9	0
Available-for-sale Securities Schedule Of Available-for-sale Securities 1		7,777
Available-for-sale Securities Schedule Of Available-for-sale Securities 2		0
Available-for-sale Securities Schedule Of Available-for-sale Securities 3		0
Available-for-sale Securities Schedule Of Available-for-sale Securities 4		34,196
Available-for-sale Securities Schedule Of Available-for-sale Securities 5		0
Available-for-sale Securities Schedule Of Available-for-sale Securities 6		0
Available-for-sale Securities Schedule Of Available-for-sale Securities 7		41,973
Available-for-sale Securities Schedule Of Available-for-sale Securities 8		0
Available-for-sale Securities Schedule Of Available-for-sale Securities 9		$ 0