Segment Information - Long-lived tangible assets by geographic region (Details) - USD ($) $ in Thousands  | 
Apr. 30, 2022  | 
Jan. 31, 2022  | 
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Total | $ 17,633 | $ 18,084 | 
| United States | ||
| Segment Reporting Information [Line Items] | ||
| Total | 14,560 | 14,735 | 
| Ireland | ||
| Segment Reporting Information [Line Items] | ||
| Total | 279 | 313 | 
| Rest of world | ||
| Segment Reporting Information [Line Items] | ||
| Total | $ 2,794 | $ 3,036 | 
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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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