Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jan. 31, 2023	Jul. 31, 2022	Jan. 31, 2022
Amount outstanding in letters of credit	$ 83.0
Surety Bonds Outstanding	13.1
Holland Creek Metropolitan District [Member]
Credit-enhanced bonds issued amount	6.3
Amount outstanding in letters of credit	6.4
Red Sky Ranch Metropolitan District [Member]
Other long-term liabilities	$ 1.7	$ 1.8	$ 1.8
Estimated cessation date of capital improvement fee payment obligation	Jul. 31, 2031
Employee Housing Bonds [Member]
Amount outstanding in letters of credit	$ 53.4
Workers' Compensation and General Liability Related to Construction and Development Activities [Member]
Amount outstanding in letters of credit	$ 29.6