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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 1.3	$ 1.1	$ 3.9	$ 3.3

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- Definition

Income Tax Expense (Benefit) Including Adjustment

+ References

No definition available.

+ Details

Name:	asan_IncomeTaxExpenseBenefitIncludingAdjustment
Namespace Prefix:	asan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration