Accumulated Other Comprehensive Income (Loss) - Change in component of accumulated comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ (3,676)	$ (3,501)
Other comprehensive (loss) before reclassifications	1,234	50
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	(131)	(225)
Balance at end of period	(2,573)	(3,676)	$ (3,501)
Income tax (expense) benefit on postretirement benefits	44	129	(1,620)
Cumulative Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(2,427)	(2,477)
Other comprehensive (loss) before reclassifications	1,234	50
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	0	0
Balance at end of period	(1,193)	(2,427)	(2,477)
Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(1,249)	(1,024)
Other comprehensive (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	131	(225)
Balance at end of period	$ (1,380)	$ (1,249)	$ (1,024)