Summary of Selected Quarterly Financial Data (unaudited) (Tables)
|12 Months Ended|
Jul. 31, 2017
|Quarterly Financial Information Disclosure [Abstract]|
|Quarterly Financial Information [Table Text Block]||Unaudited quarterly financial data for fiscal 2016 and 2015 is summarized as follows:
Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data.
Reference 1: http://www.xbrl.org/2003/role/presentationRef