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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Oct. 31, 2021
Accounting Policies [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
October 31, 2021
Carrying ValueEstimated Fair Value
6.25% Notes$600,000 $633,516 
0.0% Convertible Notes$482,754 $630,453 
EPR Secured Notes$135,310 $208,284