Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

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Basis of Presentation (Details)
3 Months Ended 6 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Clinical Labs [Member] | Sales Revenue, Net [Member]        
Basis of Presentation (Details) [Line Items]        
Concentration Risk, Percentage 38.00% 39.00% 39.00% 37.00%