Summary of Significant Accounting Policies - Long-Lived Assets by Geographic Region (Details) - USD ($) $ in Thousands	Jan. 31, 2026	Jan. 31, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 676,383	$ 396,271
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	407,804	183,244
U.K.
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	126,317	75,574
Romania
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	85,130	86,933
Netherlands
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	26,822	24,071
Rest of world
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 30,310	$ 26,449