Accumulated Other Comprehensive Income (Loss) - Change in component of accumulated comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	$ (2,095)	$ (1,962)	$ (1,120)
Other comprehensive (loss) before reclassifications	(424)	(3)	(38)
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	340	(130)	(804)
Balance at end of period	(2,179)	(2,095)	(1,962)
Income tax (expense) benefit on postretirement benefits	(183)	70	432
Cumulative Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	142	145	183
Other comprehensive (loss) before reclassifications	(424)	(3)	(38)
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	0	0	0
Balance at end of period	(282)	142	145
Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	(2,237)	(2,107)	(1,303)
Other comprehensive (loss) before reclassifications	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) after tax benefit (expense)	340	(130)	(804)
Balance at end of period	$ (1,897)	$ (2,237)	$ (2,107)