Derivative financial instruments - Summary of Fair Values Of Net Investment Contracts (Details)	Jan. 31, 2024 USD ($)
Prepaid expenses and other current assets
Investments, All Other Investments [Abstract]
Net investment contracts	$ 8,365,000
Derivative [Line Items]
Net investment contracts	8,365,000
Other assets
Investments, All Other Investments [Abstract]
Net investment contracts	84,000
Derivative [Line Items]
Net investment contracts	84,000
Accrued liabilities
Investments, All Other Investments [Abstract]
Net investment contracts	1,121,000
Derivative [Line Items]
Net investment contracts	1,121,000
Other long-term liabilities
Investments, All Other Investments [Abstract]
Net investment contracts	18,966,000
Derivative [Line Items]
Net investment contracts	$ 18,966,000