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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jan. 31, 2021
Accounting Policies [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
January 31, 2021
Carrying ValueEstimated Fair Value
6.25% Notes$600,000 $639,984 
0.0% Convertible Notes$467,758 $580,762 
EPR Secured Notes$136,512 $181,810 
EB-5 Development Notes$49,127 $50,277