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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jan. 31, 2022
Accounting Policies [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
January 31, 2022
Carrying ValueEstimated Fair Value
6.25% Notes$600,000 $623,124 
0.0% Convertible Notes$487,824 $576,466 
EPR Secured Notes$134,909 $203,120