Stock-Based Compensation - Stock Options (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jan. 31, 2016	Oct. 31, 2015	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015
Additional Disclosures
Targeted annual dividend per share (in dollars per share)				$ 1.20	$ 1.20
Stock Options
Awards (in Shares)
Outstanding, Beginning Balance (in shares)	2,398,498	2,119,683		2,119,683
Granted (in shares)	10,000	480,265
Expired/canceled (in shares)	(58,240)	(182,250)
Exercised (in shares)	0	(19,200)
Outstanding, Ending Balance (in shares)	2,350,258	2,398,498		2,350,258
Exercisable, Ending Balance (in shares)	1,050,880			1,050,880
Vested and Expected to Vest, Ending Balance (in shares)	2,259,510			2,259,510
Weighted Average Exercise Price
Outstanding, Beginning Balance (in dollars per share)	$ 29.04	$ 29.33		$ 29.33
Granted (in dollars per share)	20.90	28.00
Expired/canceled (in dollars per share)	28.84	29.84
Exercised (in dollars per share)		27.24
Outstanding, Ending Balance (in dollars per share)	29.01	$ 29.04		29.01
Exercisable, Ending Balance (in dollars per share)	28.59			28.59
Vested and Expected to Vest, Ending Balance (in dollars per share)	$ 28.99			$ 28.99
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending Balance				6 years 10 months 22 days
Exercisable, Ending Balance				5 years 5 months 2 days
Vested And Expected To Vest, Ending Balance				6 years 10 months 2 days
Aggregate Intrinsic Value
Outstanding, Ending Balance	$ 0			$ 0
Exercisable, Ending Balance	0			0
Vested and Expected to Vest, Ending Balance	$ 0			$ 0
Additional Disclosures
Exercise price, lower range limit (in dollars per share)				$ 20.90
Exercise price, upper range limit (in dollars per share)				$ 33.94
Total intrinsic value of stock-based awards settled			$ 806,000	$ 32,000	$ 1,959,000
Vested Stock Based Awards Net Settled Upon Exercise (in shares)				19,200	280,288
Stock Issued During The Period, Shares, Net Settlement Of Stock-Based Awards				706	45,989
Per share weighted average grant date fair value of stock based awards granted (in dollars per share)	$ 3.69		$ 6.46	$ 5.69	$ 6.14
Fair Value Assumptions
Expected dividend yield	5.74%		3.55%	4.32%	3.54%
Expected volatility	34.76%		29.98%	34.27%	28.13%
Risk-free interest rate	1.64%		1.36%	1.54%	1.61%
Expected life (years)	5 years 15 days		5 years 5 months 23 days	5 years 1 month 28 days	5 years 5 months 12 days
Minimum | Stock Options
Additional Disclosures
Contractual term (in years)				5 years	5 years
Vesting period (in years)				3 years
Maximum | Stock Options
Additional Disclosures
Contractual term (in years)				10 years	10 years
Vesting period (in years)				5 years
Granted since fiscal 2014 | Performance shares
Additional Disclosures
Vesting period (in years)					3 years