Fair Value, Assets Measured on Recurring Basis (Details)	3 Months Ended
	Oct. 31, 2016 USD ($)
Fair Value Of Financial Instruments Fair Value, Assets Measured On Recurring Basis 1	$ 2,629
Fair Value Of Financial Instruments Fair Value, Assets Measured On Recurring Basis 2	0
Fair Value Of Financial Instruments Fair Value, Assets Measured On Recurring Basis 3	0
Fair Value Of Financial Instruments Fair Value, Assets Measured On Recurring Basis 4	2,629
Fair Value Of Financial Instruments Fair Value, Assets Measured On Recurring Basis 5	$ 534