Stock-Based Compensation Narrative (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended				3 Months Ended
	Jan. 31, 2014 Stock Options	Jan. 31, 2013 Stock Options	Jan. 31, 2014 Stock Options	Jan. 31, 2013 Stock Options	Jan. 31, 2014 Restricted Stock	Jan. 31, 2013 Restricted Stock	Jan. 31, 2014 Restricted Stock	Jan. 31, 2014 Directors' Plan Stock Options	Jan. 31, 2014 2006 Plan	Jan. 31, 2014 2006 Plan Restricted Stock	Jan. 31, 2013 2006 Plan Restricted Stock	Jan. 31, 2014 2006 Plan Restricted Stock	Jan. 31, 2013 2006 Plan Restricted Stock	Jan. 31, 2014 2006 Plan - Director Stock Option Stock Options	Jan. 31, 2014 2006 Plan - Employee Stock Options Stock Options	Oct. 31, 2013 Common Stock Restricted Stock	Oct. 31, 2013 Common Class B Restricted Stock	Oct. 31, 2012 Common Class B Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Number Authorized (shares)									937,500
Award Vesting Period (Years)								1 year						1 year
Annual Vesting Percentage															25.00%
Number of years after grant date vesting starts (years)															2 years
Number of consecutive years vesting occurs after initial vest date (years)															3 years
Number available for grant (shares)								0
Number of shares exercised	0		4,000
Cash Received from Exercise of Stock Options		$ 591,000	$ 51,000	$ 652,000
Tax Benefit Realized from Exercise of Stock Options		255,000	24,000	268,000
Options, Granted (shares)			0	0
Award Vesting Period, Minimum (years)												2 years
Award Vesting Period, Maximum (years)												5 years
Restricted Stock Granted, Number (shares)					0	0	32,000									22,000	10,000	7,000
Share-based Compensation Expense										$ 319,000	$ 210,000	$ 560,000	$ 413,000