Stock-Based Compensation Stock Options (Details) (USD $)	3 Months Ended					9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Apr. 30, 2014	Oct. 31, 2013	Apr. 30, 2014 Stock options (including SARs)	Jan. 31, 2014 Stock options (including SARs)	Oct. 31, 2013 Stock options (including SARs)	Apr. 30, 2014 Stock options (including SARs)	Apr. 30, 2014 Stock Options	Apr. 30, 2013 Stock Options	Apr. 30, 2014 Stock Options	Apr. 30, 2013 Stock Options	Apr. 30, 2014 SARs	Apr. 30, 2013 SARs	Apr. 30, 2014 SARs	Apr. 30, 2013 SARs
Awards (in Shares)
Outstanding, Beginning Balance			2,744,445	2,877,620	3,047,910	3,047,910
Granted			8,460	11,000	247,000						0	0	0	0
Expired/canceled			(15,220)	(52,800)	(413,240)
Exercised			(124,505)	(91,375)	(4,050)						0	0	0	0
Outstanding, Ending Balance			2,613,180	2,744,445	2,877,620	2,613,180
Exercisable, Ending Balance			1,281,048			1,281,048
Vested and Expected to Vest, Ending Balance			2,554,057			2,554,057
Weighted Average Exercise Price
Outstanding, Beginning Balance			$ 27.48	$ 27.46	$ 29.94	$ 29.94
Granted			$ 30.12	$ 31.29	$ 27.23
Expired/canceled			$ 30.72	$ 27.80	$ 45.66
Exercised			$ 27.61	$ 27.14	$ 19.54
Outstanding, Ending Balance			$ 27.46	$ 27.48	$ 27.46	$ 27.46
Exercisable, Ending Balance			$ 27.11			$ 27.11
Vested and Expected to Vest, Ending Balance			$ 27.45			$ 27.45
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending Balance						5 years 5 months 20 days
Exercisable, Ending Balance						2 years 11 months 27 days
Vested And Expected To Vest, Ending Balance						5 years 5 months 2 days
Aggregate Intrinsic Value
Outstanding, Ending Balance			$ 11,220,000			$ 11,220,000
Exercisable, Ending Balance			5,964,000			5,964,000
Vested and Expected to Vest, Ending Balance			10,998,000			10,998,000
Additional Disclosures
Exercise price, lower range limit						$ 13.19
Exercise price, upper range limit						$ 35.79
Total intrinsic value of stock-based awards exercised							$ 533,000	$ 149,000	$ 965,000	$ 413,000
Contractual term (in years)									10 years	10 years
Vesting period (in years)									5 years	5 years
Per share weighted average grant date fair value of stock based awards granted							$ 5.91		$ 5.51	$ 5.46
Targeted annual dividend per share	$ 1.20	$ 1.10
Fair Value Assumptions
Expected dividend yield							3.98%		4.03%	4.29%
Expected volatility							32.00%		32.83%	37.00%
Risk-free interest rate							1.49%		1.39%	0.61%
Expected life (years)							5 years 3 months 22 days		5 years 5 months 5 days	5 years 3 months 22 days