Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.19.3.a.u2
Basis of Presentation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Aug. 01, 2019
Jul. 31, 2019
Basis of Presentation (Details) [Line Items]            
Operating Lease, Right-of-Use Asset $ 22,013,000   $ 22,013,000   $ 24,400,000
Operating Lease, Liability 22,838,000   22,838,000   $ 25,100,000  
Deferred Rent Credit, Current 700,000   700,000      
Cumulative Effect on Retained Earnings, before Tax     0      
Income Tax Expense (Benefit) $ 0 $ 0 $ 0 $ 0    
Clinical Services [Member] | Revenue Benchmark [Member]            
Basis of Presentation (Details) [Line Items]            
Concentration Risk, Percentage     64.00% 65.00%    
Clinical Services [Member] | Revenue Benchmark [Member] | Third Party Payer And Health Maintenance Organizations [Member]            
Basis of Presentation (Details) [Line Items]            
Concentration Risk, Percentage 27.00% 42.00% 27.00% 42.00%    
Clinical Services [Member] | Accounts Receivable [Member] | Third Party Payer And Health Maintenance Organizations [Member]            
Basis of Presentation (Details) [Line Items]            
Concentration Risk, Percentage     17.00%