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Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Thousands
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Consolidated Statements of Cash Flows [Abstract]        
Cash and cash equivalents $ 5,892 $ 5,716 $ 5,536 $ 571