Investments in Marketable Securities (Details 1) In Thousands, unless otherwise specified	12 Months Ended																	12 Months Ended
	Jan. 31, 2013 USD ($)		Jan. 31, 2012 USD ($)		Jan. 31, 2011 USD ($)	Sep. 01, 2012 USD ($)		Sep. 01, 2012 EUR (€)		Sep. 01, 2009 USD ($)		Sep. 01, 2009 EUR (€)		Jan. 31, 2013 Fair Value, Inputs, Level 3 [Member] USD ($)		Jan. 31, 2012 Fair Value, Inputs, Level 3 [Member] USD ($)		Jan. 31, 2013 Accrued Contingent Consideration [Member] Fair Value, Inputs, Level 3 [Member] USD ($)
Ending balance January 31, 2012	$ 12,255	[1]				$ 2,200	[1]	€ 1,700	[1]	$ 1,000	[1]	€ 800	[1]	$ 5,656	[1]	$ 12,255	[1]	$ 12,255
Additional contingent earnout																		2,222
Contingency payments																		(8,453)
Change in fair value	1,662		3,031		0													194
Translation adjustment																		(562)
Ending balance January 31, 2013	$ 5,656	[1]	$ 12,255	[1]		$ 2,200	[1]	€ 1,700	[1]	$ 1,000	[1]	€ 800	[1]	$ 5,656	[1]	$ 12,255	[1]	$ 5,656

[1] The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any earn-out that will be achieved based on expected future performance by the acquired entity, as well as the fair value of fixed purchase price.