Accumulated Other Comprehensive Income (Loss) - Change in component of accumulated comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ (2,573)	$ (3,676)
Other comprehensive (loss) before reclassifications	(1,045)	1,234
Reclassification of Income Tax Effects due to adoption of ASU 2018-02	(280)
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	342	(131)
Balance at end of period	(3,556)	(2,573)	$ (3,676)
Income tax (expense) benefit on postretirement benefits	(99)	44	129
Cumulative Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,193)	(2,427)
Other comprehensive (loss) before reclassifications	(1,045)	1,234
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	(2,238)	(1,193)	(2,427)
Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,380)	(1,249)
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)	(342)	(131)
Balance at end of period	$ (1,318)	$ (1,380)	$ (1,249)