Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

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Basis of Presentation (Details)
3 Months Ended 9 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Sales Revenue, Net [Member] | Clinical Labs [Member]        
Basis of Presentation (Details) [Line Items]        
Concentration Risk, Percentage 40.00% 38.00% 39.00% 38.00%