Contingent Liabilities, Commitments and Legal Matters (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2021	Jul. 31, 2021
Loss Contingencies [Line Items]
Standby repurchase obligations amount	$ 2,322,610	$ 1,821,012
Term of commitments	18 months
Repurchase and guarantee reserve balances	$ 6,980	$ 6,023
Selling, General and Administrative Expenses
Loss Contingencies [Line Items]
Expenses recorded related to product recall costs	$ 22,000