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Incentive Stock Rights	6 Months Ended
Incentive Stock Rights	Jul. 31, 2015
Incentive Stock Rights [Abstract]
Incentive Stock Rights	Incentive Stock Rights On June 24, 2010, our Board of Directors adopted an Incentive Stock Purchase Rights Plan and declared a dividend distribution of one right for each outstanding share of common stock, payable to holders of record on July 6, 2010. The rights would become exercisable if a person or group acquired or commenced a tender offer to acquire a set threshold of our outstanding common stock. The Plan was subsequently amended in 2011 and 2013 to extend its termination date and make certain other changes. On June 30, 2015, the Plan expired in accordance with its terms.