Stock-Based Compensation Stock Options (Details) (USD $)	3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012
Additional Disclosures
Targeted annual dividend per share	$ 1.10
Stock options (including SARs)
Awards (in Shares)
Outstanding, Beginning Balance	3,047,910
Granted	247,000
Expired/canceled	(413,240)
Exercised	(4,050)
Outstanding, Ending Balance	2,877,620
Exercisable, Ending Balance	1,499,240
Vested and Expected to Vest, Ending Balance	2,776,031
Weighted Average Exercise Price
Outstanding, Beginning Balance	$ 29.94
Granted	$ 27.23
Expired/canceled	$ 45.66
Exercised	$ 19.54
Outstanding, Ending Balance	$ 27.46
Exercisable, Ending Balance	$ 27.18
Vested and Expected to Vest, Ending Balance	$ 27.44
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending Balance	5 years 7 months 28 days
Exercisable, Ending Balance	3 years 2 months 19 days
Vested And Expected To Vest, Ending Balance	5 years 6 months 26 days
Aggregate Intrinsic Value
Outstanding, Ending Balance	$ 7,426,000
Exercisable, Ending Balance	4,313,000
Vested and Expected to Vest, Ending Balance	7,207,000
Additional Disclosures
Exercise price, lower range limit	$ 13.19
Exercise price, upper range limit	$ 35.79
Stock Options
Awards (in Shares)
Granted		0
Additional Disclosures
Total intrinsic value of stock-based awards exercised	$ 41,000	$ 350,000
Contractual term (in years)	10 years
Vesting period (in years)	5 years
Per share weighted average grant date fair value of stock based awards granted	$ 5.47
Fair Value Assumptions
Expected dividend yield	4.04%
Expected volatility	32.89%
Risk-free interest rate	1.38%
Expected life (years)	5 years 5 months 9 days
SARs
Awards (in Shares)
Granted	0	0
Exercised	0	0