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Declaration of Special Cash Dividend	9 Months Ended
Declaration of Special Cash Dividend	Oct. 31, 2013
Text Block [Abstract]
Declaration of Special Cash Dividend	NOTE 3—DECLARATION OF SPECIAL CASH DIVIDEND In September 2013, the Company’s board of directors declared a special cash dividend of $0.75 per share of common stock, which was paid on November 7, 2013 to stockholders of record at the close of business on October 15, 2013. In September 2012, the Company’s Board of Directors declared a special cash dividend of $0.60 per share of common stock, which was paid on November 7, 2012 to stockholders of record on October 11, 2012.