Stock Split	12 Months Ended
Jan. 31, 2015
Stockholders Equity Note [Abstract]
Stock Split	(4) Stock Split On April 2, 2014, the Company’s board of directors approved an amendment to the Company’s amended and restated certificate of incorporation to effect a 2.87-for-1 stock split of the Company’s common stock and restricted nonvoting common stock and to increase the number of authorized shares of capital stock that the Company is authorized to issue to 110,000 shares of capital stock in aggregate, consisting of 100,000 shares of common stock and 10,000 shares of restricted nonvoting common stock. The certificate of amendment giving effect to the stock split was filed on April 3, 2014. On April 16, 2014, the Company adopted a new charter, under which the Company is authorized to issue up to 120,000 shares of capital stock in aggregate, consisting of 100,000 shares of common stock and 20,000 shares of preferred stock. All information in the accompanying condensed consolidated financial statements and the related notes thereto related to common stock, restricted nonvoting common stock, restricted stock unit awards and earnings per share have been adjusted to reflect the 2.87-for-1 stock split.

(4) Stock Split

On April 2, 2014, the Company’s board of directors approved an amendment to the Company’s amended and restated certificate of incorporation to effect a 2.87-for-1 stock split of the Company’s common stock and restricted nonvoting common stock and to increase the number of authorized shares of capital stock that the Company is authorized to issue to 110,000 shares of capital stock in aggregate, consisting of 100,000 shares of common stock and 10,000 shares of restricted nonvoting common stock. The certificate of amendment giving effect to the stock split was filed on April 3, 2014. On April 16, 2014, the Company adopted a new charter, under which the Company is authorized to issue up to 120,000 shares of capital stock in aggregate, consisting of 100,000 shares of common stock and 20,000 shares of preferred stock. All information in the accompanying condensed consolidated financial statements and the related notes thereto related to common stock, restricted nonvoting common stock, restricted stock unit awards and earnings per share have been adjusted to reflect the 2.87-for-1 stock split.