Employee Retirement Benefits (Defined Contribution Plan) (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2016 USD ($) contribution_plan	Jan. 31, 2015 USD ($)	Jan. 31, 2014 USD ($)
Schedule of Defined Contribution Plans Disclosure [Line Items]
Number of defined contribution plans | contribution_plan	2
Current payroll matching percentage by the Company	4.00%
Participant contribution rate for company stock, maximum	20.00%
Total contribution expense | $	$ 1,952	$ 2,416	$ 2,412
Vista Research [Member]
Schedule of Defined Contribution Plans Disclosure [Line Items]
Current payroll matching percentage by the Company	4.00%	3.00%