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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, 2015	Jan. 31, 2014	Jan. 31, 2013
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Balance at beginning of year	$ 3,684us-gaap_EquityMethodInvestments	$ 4,063us-gaap_EquityMethodInvestments
Income from equity investment	28	116	156
Balance at end of year	3,217us-gaap_EquityMethodInvestments	3,684us-gaap_EquityMethodInvestments	4,063us-gaap_EquityMethodInvestments
SST [Member]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Balance at beginning of year	3,684	4,063	4,409
Income from equity investment	28	116	156
Amortization of intangible assets	(495)	(495)	(477)
Dividend received	0	0	(25)
Balance at end of year	$ 3,217	$ 3,684	$ 4,063

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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