Organization and Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	Jul. 31, 2021 USD ($) State
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of states in which entity operates | State	43
COVID-19 Pandemic [Member] | Prepaid Expenses and Other Current Assets [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Income tax receivable, COVID-19 | $	$ 520