Stock-Based Compensation - Stock Options (Details) - USD ($)		3 Months Ended
	Oct. 31, 2019	Oct. 31, 2019	Oct. 31, 2018
Additional Disclosures
Stock Issued During The Period, Shares, Net Settlement Of Stock-Based Awards		4,764	9,345
Stock Options
Awards (in Shares)
Outstanding, Beginning Balance (in shares)		1,555,555
Exercised (in shares)		(51,460)
Expired/canceled (in shares)		(800)
Outstanding, Ending Balance (in shares)	1,503,295	1,503,295
Exercisable (in shares)	1,431,765	1,431,765
Vested and Expected to Vest, Ending Balance (in shares)	1,477,967	1,477,967
Weighted Average Exercise Price
Outstanding, Beginning Balance (in dollars per share)		$ 28.72
Exercised (in dollars per share)		28.45
Expired/canceled (in dollars per share)		27.35
Outstanding, Ending Balance (in dollars per share)	$ 28.73	28.73
Exercisable, Ending Balance (in dollars per share)	28.83	28.83
Vested and Expected to Vest, Ending Balance (in dollars per share)	$ 28.76	$ 28.76
Weighted Average Remaining Contractual Term (Years)
Outstanding, Ending Balance		3 years 3 months 9 days
Exercisable, Ending Balance		3 years 1 month 22 days
Vested And Expected To Vest, Ending Balance		3 years 2 months 23 days
Aggregate Intrinsic Value
Outstanding, Ending Balance	$ 9,346,000	$ 9,346,000
Exercisable, Ending Balance	8,761,000	8,761,000
Vested and Expected to Vest, Ending Balance	$ 9,148,000	9,148,000
Additional Disclosures
Exercise price, lower range limit (in dollars per share)	$ 20.90
Exercise price, upper range limit (in dollars per share)	$ 33.94
Granted (in shares)			0
Total intrinsic value of stock-based awards settled		$ 305,000	$ 561,000
Vested stock based awards net settled upon exercise (in shares)		40,860	72,830
Minimum | Stock Options
Additional Disclosures
Contractual term (in years)	5 years
Vesting period (in years)	3 years
Maximum | Stock Options
Additional Disclosures
Contractual term (in years)	10 years
Vesting period (in years)	5 years