Derivative financial instruments - Summary of Fair Values Of Net Investment Contracts (Details)	Jul. 31, 2024 USD ($)
Prepaid expenses and other current assets
Investments, All Other Investments [Abstract]
Net investment contracts	$ 5,579,000
Derivative [Line Items]
Net investment contracts	5,579,000
Other assets
Investments, All Other Investments [Abstract]
Net investment contracts	255,000
Derivative [Line Items]
Net investment contracts	255,000
Accrued liabilities
Investments, All Other Investments [Abstract]
Net investment contracts	7,827,000
Derivative [Line Items]
Net investment contracts	7,827,000
Other long-term liabilities
Investments, All Other Investments [Abstract]
Net investment contracts	9,273,000
Derivative [Line Items]
Net investment contracts	$ 9,273,000