Acquisitions of and Investments in Businesses and Technologies - Changes in the net carrying value of the investment in SST (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Balance at beginning of year	$ 4,063	$ 4,409
Income from equity investment	116	156	156
Balance at end of year	3,684	4,063	4,409
SST [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Balance at beginning of year	4,063	4,409	4,728
Income from equity investment	116	156	156
Amortization of intangible assets	(495)	(477)	(475)
Dividend received	0	(25)	0
Balance at end of year	$ 3,684	$ 4,063	$ 4,409