Income Tax Effective tax rate (Tables)

9 Months Ended

Oct. 31, 2019

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 Ended				Nine Months Ended
	October 31, 2019		October 31, 2018		October 31, 2019		October 31, 2018
Effective tax rate	13.0	%	8.6	%	14.7	%	15.6	%

discrete tax benefit (expense) [Table Text Block]

	Three Months Ended				Nine Months Ended
	October 31, 2019		October 31, 2018		October 31, 2019		October 31, 2018
Discrete tax benefit	$	268	$	1,440	$	1,336	$	2,129