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Stockholders' Equity	6 Months Ended
Stockholders' Equity	Jan. 31, 2013
Text Block [Abstract]
Stockholders' Equity	Stockholders’ Equity On September 9, 2011, the Company’s Board of Directors authorized a share repurchase program for up to two million shares of the Company’s Class A Nonvoting Common Stock. The plan may be implemented by purchasing shares in the open market or in privately negotiated transactions, with repurchased shares available for use in connection with the Company’s stock-based plans and for other corporate purposes. As of July 31, 2012, there remained 334,940 shares to purchase in connection with this share repurchase plan. During the three months ended October 31, 2012, the Company purchased 188,167 shares of its Class A Nonvoting Common Stock under this plan for $5,121. There were no share repurchases during the three months ended January 31, 2013. On September 6, 2012, the Company’s Board of Directors authorized an additional share repurchase program for up to two million additional shares of the Company’s Class A Nonvoting Common Stock. As of January 31, 2013, there remained 2,146,773 shares to purchase in connection with the Company’s share repurchase plans.