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Income Taxes - Provision (Recovery) for Income Taxes from the Expected Provision at the Statutory Rates (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Income Taxes.      
Income before income taxes $ 151,152 $ 133,728 $ 102,610
Combined basic Canadian statutory rates 26.50% 26.50% 26.50%
Income tax expense based on the above rates $ 40,055 $ 35,438 $ 27,192
Permanent differences including amortization of intangible assets 124 590 3,467
Effect of differences between Canadian and foreign tax rates (1,293) (1,859) (1,855)
Effect of rate changes on current year timing differences (48) (219) (1,085)
Change in estimates relating to prior periods (2,888) (972) (569)
Increase (decrease) in accruals for uncertain tax positions (117) (1,181) (849)
Valuation allowance 263 (155) (9,102)
Other, including foreign exchange and tax credits (851) (150) (871)
Income tax expense $ 35,245 $ 31,492 $ 16,328