Derivative financial instruments - Summary of Fair Values Of Net Investment Contracts (Details)	Apr. 30, 2024 USD ($)
Prepaid expenses and other current assets
Investments, All Other Investments [Abstract]
Net investment contracts	$ 7,683,000
Derivative [Line Items]
Net investment contracts	7,683,000
Other assets
Investments, All Other Investments [Abstract]
Net investment contracts	1,465,000
Derivative [Line Items]
Net investment contracts	1,465,000
Accrued liabilities
Investments, All Other Investments [Abstract]
Net investment contracts	3,632,000
Derivative [Line Items]
Net investment contracts	3,632,000
Other long-term liabilities
Investments, All Other Investments [Abstract]
Net investment contracts	7,612,000
Derivative [Line Items]
Net investment contracts	$ 7,612,000