Employee Benefit Plans Employee Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 1,400,000	$ 1,500,000	$ 1,600,000
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	70.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage	30.00%
Other Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 200,000
Defined Benefit Plan, Benefit Obligation	$ 3,100,000	2,900,000
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	6.80%
Defined Benefit Plan Health Care Cost Trend Rate In Future Period	5.00%
Foreign Defined Benefit Plan, Net Periodic Benefit Cost	$ 100,000	(100,000)	(200,000)
Other Current Liabilities and Other Long-term Liabilities [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Liability, Current and Noncurrent	$ 18,400,000	20,100,000
401(k) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	50.00%
Maximum Percentage Of Core Contributions Made By Employer	3.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	25.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	6.00%
Company Contributions	$ 0.50
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount	$ 1
Defined Contribution Plan, Employer Discretionary Contribution Amount	3.00%
Defined Contribution Plan, Cost	$ 2,700,000	3,100,000	3,200,000
Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	1,600,000	1,700,000
Defined Contribution Plan, Cost	$ 400,000	300,000	$ 300,000
Minimum | Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan Employer Contribution Percentage	3.00%
Maximum | Supplemental Executive Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Contribution Plan Employer Contribution Percentage	6.00%
UNITED STATES | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax	$ (16,100,000)	$ (13,200,000)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	$ 1,200,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	2.90%	4.05%	3.60%
Defined Benefit Plan, Expected Long Term Rate Of Returns On Assets Assumption	4.60%
Amount of benefits expected to be paid in fiscal 2020	$ 3,000,000
Amount of benefits expected to be paid in fiscal 2021	3,000,000
Amount of benefits expected to be paid in fiscal 2022	3,000,000
Amount of benefits expected to be paid in, fiscal 2023	3,000,000
Amount of benefits expected to be paid in, fiscal 2024	3,000,000
Amount of benefits expected to be paid fiscal 2025 through fiscal 2027	14,500,000
Defined Benefit Plan, Benefit Obligation	47,400,000	$ 43,280,000	$ 46,806,000
Foreign Defined Benefit Plan, Net Periodic Benefit Cost	476,000	92,000	(36,000)
Company Contributions	$ 108,000	$ 108,000
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		2.00%
Foreign Plan [Member] | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	1.10%
Defined Benefit Plan, Expected Long Term Rate Of Returns On Assets Assumption	4.20%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 300,000
Amount of benefits expected to be paid in fiscal 2020	200,000
Amount of benefits expected to be paid in fiscal 2021	300,000
Amount of benefits expected to be paid in fiscal 2022	400,000
Amount of benefits expected to be paid in, fiscal 2023	300,000
Amount of benefits expected to be paid fiscal 2025 through fiscal 2027	1,900,000
Defined Benefit Plan, Benefit Obligation	15,103,000	$ 13,056,000	13,423,000
Foreign Defined Benefit Plan, Net Periodic Benefit Cost	504,000	607,000	$ 918,000
Company Contributions	$ 374,000	$ 588,000