Accumulated Other Comprehensive Income (Loss) - Change in component of accumulated comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ (3,556)	$ (2,573)
Other comprehensive (loss) before reclassifications	(994)	(1,045)
Reclassification of Income Tax Effects due to adoption of ASU 2018-02		(280)
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	(865)	342
Balance at end of period	(5,415)	(3,556)	$ (2,573)
Income tax (expense) benefit on postretirement benefits	251	(99)	44
Cumulative Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(2,238)	(1,193)
Other comprehensive (loss) before reclassifications	(994)	(1,045)
Reclassification of Income Tax Effects due to adoption of ASU 2018-02		0
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	0	0
Balance at end of period	(3,232)	(2,238)	(1,193)
Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,318)	(1,380)
Other comprehensive (loss) before reclassifications	0	0
Reclassification of Income Tax Effects due to adoption of ASU 2018-02		(280)
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	865	342
Balance at end of period	$ (2,183)	$ (1,318)	$ (1,380)