Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Apr. 30, 2013
Line of Credit Facility [Line Items]
Maturity date	Nov. 30, 2016
Line of Credit Facility, Maximum Borrowing Capacity	$ 38
Line of Credit Facility, Dividend Restrictions	do not permit payment of dividends
Line of Credit Facility, Covenant Compliance	in compliance with all covenants under the Loan Agreement
Line of Credit Facility, Interest Rate Description	(a) a margin in effect plus prime rate; or (b) a margin in effect plus the LIBOR rate for the corresponding interest period.
Line of Credit Facility, Interest Rate at Period End	3.25%
Line of Credit Facility, Amount Outstanding	9
Line of Credit Facility, Remaining Borrowing Capacity	10
Letters of Credit Outstanding, Amount	0.2
Restricted Cash and Cash Equivalents, Current	$ 0.8
Line of Credit Prime Rate [Member]
Line of Credit Facility [Line Items]
Margin added to rate	0.50%
Line of Credit Libor Rate [Member]
Line of Credit Facility [Line Items]
Margin added to rate	2.75%