Financing Arrangements (Details) (USD $)	12 Months Ended			1 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012 Vista Research [Member]
Line of Credit Facility [Line Items]
Borrowing capacity under line of credit	$ 10,500,000
Maturity date of the line of credit	Nov. 30, 2013
Line of credit prime interest rate percentage	1.50%
Letters of credit issued, amount	992,000
Borrowing outstanding under line of credit	0	0	0
Remaining borrowing capacity under the line of credit	9,508,000
Liabilities Assumed				2,869,000
Line of Credit Facility, Maximum Amount Outstanding During Period	0	0	0	0
Total rent and lease expense	$ 2,095,000	$ 759,000	$ 546,000