Stock-Based Compensation - Stock Options (Details) - USD ($)	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
Stock Options
Awards (in Shares)
Outstanding, Beginning Balance (in shares)	2,256,679
Expired/canceled (in shares)	(118,505)
Exercised (in shares)	0
Outstanding, Ending Balance (in shares)	2,138,174
Exercisable, Ending Balance (in shares)	1,391,070
Vested and Expected to Vest, Ending Balance (in shares)	2,072,008
Weighted Average Exercise Price
Outstanding, Beginning Balance (in dollars per share)	$ 28.87
Expired/canceled (in dollars per share)		$ 27.34
Outstanding, Ending Balance (in dollars per share)	28.96
Exercisable, Ending Balance (in dollars per share)	29.15
Vested and Expected to Vest, Ending Balance (in dollars per share)	$ 28.96
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending Balance	5 years 9 months 15 days
Exercisable, Ending Balance	4 years 9 months 26 days
Vested And Expected To Vest, Ending Balance	5 years 8 months 23 days
Aggregate Intrinsic Value
Outstanding, Ending Balance	$ 0
Exercisable, Ending Balance	0
Vested and Expected to Vest, Ending Balance	$ 0
Additional Disclosures
Exercise price, lower range limit (in dollars per share)	$ 12.43
Exercise price, upper range limit (in dollars per share)	$ 33.94
Total intrinsic value of stock-based awards settled		$ 32,000
Stock options granted in period (in shares)	0
Vested stock based awards net settled upon exercise (in shares)	0	19,200
Common stock issued for net settlement of stock-based awards (in shares)		706
Per share weighted average grant date fair value of stock based awards granted (in dollars per share)		$ 5.73
Fair Value Assumptions
Expected dividend yield		4.29%
Expected volatility		34.26%
Risk-free interest rate		1.54%
Expected life (years)		5 years 1 month 29 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