Accumulated Other Comprehensive Income (Loss) - Change in component of accumulated comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Supplemental Income Statement Elements [Abstract]
Balance at beginning of period	$ (5,415)	$ (3,556)
Other comprehensive (loss) before reclassifications	2,299	(994)
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	(225)	(865)
Balance at end of period	(3,341)	(5,415)	$ (3,556)
Income tax (expense) benefit on postretirement benefits	65	251	(99)
Cumulative Foreign Currency Translation Adjustment
Supplemental Income Statement Elements [Abstract]
Balance at beginning of period	(3,232)	(2,238)
Other comprehensive (loss) before reclassifications	2,299	(994)
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	0	0
Balance at end of period	(933)	(3,232)	(2,238)
Postretirement Benefits
Supplemental Income Statement Elements [Abstract]
Balance at beginning of period	(2,183)	(1,318)
Other comprehensive (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	(225)	(865)
Balance at end of period	$ (2,408)	$ (2,183)	$ (1,318)