Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.19.3.a.u2
Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Aug. 01, 2019
Jul. 31, 2019
Basis of Presentation (Details) [Line Items]        
Operating Lease, Right-of-Use Asset $ 23,201   $ 24,400
Operating Lease, Liability 23,980   $ 25,100  
Deferred Rent Credit, Current 700      
Cumulative Effect on Retained Earnings, before Tax 0      
Income Tax Expense (Benefit) $ 0 $ 0    
Clinical Services [Member] | Revenue Benchmark [Member]        
Basis of Presentation (Details) [Line Items]        
Concentration Risk, Percentage 63.00% 67.00%    
Clinical Services [Member] | Revenue Benchmark [Member] | Third Party Payer And Health Maintenance Organizations [Member]        
Basis of Presentation (Details) [Line Items]        
Concentration Risk, Percentage 28.00% 41.00%    
Clinical Services [Member] | Accounts Receivable [Member] | Third Party Payer And Health Maintenance Organizations [Member]        
Basis of Presentation (Details) [Line Items]        
Concentration Risk, Percentage 26.00%