Incentive Stock Rights	9 Months Ended
Oct. 31, 2013
Incentive Stock Rights [Abstract]
Incentive Stock Rights	Incentive Stock Rights—Our Board of Directors has the authority to issue incentive stock in one or more series and to determine the relative rights and preferences of the incentive stock. On June 24, 2010, we 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. On December 23, 2011, our Board of Directors amended the Stock Purchase Rights Plan to, among other things, extend the expiration date of the rights and increase the exercise price of each right. On June 28, 2013, our Board of Directors amended the Stock Purchase Rights Plan to extend the expiration date of the rights, change the ownership threshold for certain types of investors, increase the exercise price of each right, and add a qualifying offer provision. As long as the rights are attached to our common stock, we will issue one right with each new share of common stock so that all such shares will have attached rights. Under certain conditions, each right may be exercised to purchase 1/10,000 of a share of Series B Junior Participating Incentive Stock at a purchase price of ninety dollars, subject to adjustment. The rights are not presently exercisable and will only become exercisable if a person or group acquires or commences a tender offer to acquire 15% (20% for certain types of "passive institutional investors") or more of our common stock. If a person or group acquires 15% (20% for certain types of "passive institutional investors") or more of our common stock, each right will be adjusted to entitle its holder to receive, upon exercise, common stock (or, in certain circumstances, other assets of ours) having a value equal to two times the exercise price of the right, or each right will be adjusted to entitle its holder to receive, upon exercise, common stock of the acquiring company having a value equal to two times the exercise price of the right, depending on the circumstances. The rights expire on June 30, 2015 and may be redeemed by us for $0.001 per right. The rights do not have voting or dividend rights and have no dilutive effect on our earnings.

Incentive Stock Rights—Our Board of Directors has the authority to issue incentive stock in one or more series and to determine the relative rights and preferences of the incentive stock. On June 24, 2010, we 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. On December 23, 2011, our Board of Directors amended the Stock Purchase Rights Plan to, among other things, extend the expiration date of the rights and increase the exercise price of each right. On June 28, 2013, our Board of Directors amended the Stock Purchase Rights Plan to extend the expiration date of the rights, change the ownership threshold for certain types of investors, increase the exercise price of each right, and add a qualifying offer provision. As long as the rights are attached to our common stock, we will issue one right with each new share of common stock so that all such shares will have attached rights. Under certain conditions, each right may be exercised to purchase 1/10,000 of a share of Series B Junior Participating Incentive Stock at a purchase price of ninety dollars, subject to adjustment. The rights are not presently exercisable and will only become exercisable if a person or group acquires or commences a tender offer to acquire 15% (20% for certain types of "passive institutional investors") or more of our common stock.

If a person or group acquires 15% (20% for certain types of "passive institutional investors") or more of our common stock, each right will be adjusted to entitle its holder to receive, upon exercise, common stock (or, in certain circumstances, other assets of ours) having a value equal to two times the exercise price of the right, or each right will be adjusted to entitle its holder to receive, upon exercise, common stock of the acquiring company having a value equal to two times the exercise price of the right, depending on the circumstances. The rights expire on June 30, 2015 and may be redeemed by us for $0.001 per right. The rights do not have voting or dividend rights and have no dilutive effect on our earnings.