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Income Tax Effective tax rate (Tables)
6 Months Ended
Jul. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] The Company’s effective tax rates were as follows:
Three Months EndedSix Months Ended
July 31,
2021
July 31,
2020
July 31,
2021
July 31,
2020
Effective tax rate15.0 %10.8 %16.2 %2.2 %