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Commitments and Contingencies (Tables)
 12 Months Ended
Jul. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Future minimum annual rental payments under these operating leases as of July 31, 2016, are as follows:
2017
2018
2019
2020
2021
Thereafter
$38
$31
$25
$22
$16
$26