Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans Employee Benefit Plans - Additional Information (Details)

v3.21.2
Employee Benefit Plans Employee Benefit Plans - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Sep. 30, 2020
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Defined Benefit Plan Disclosure [Line Items]          
Deferred Compensation Arrangement with Individual, Compensation Expense     $ 1,200,000 $ 1,100,000 $ 1,400,000
Equity Securities          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage     30.00%    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage     50.00%    
Fixed Income Securities          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Percentage     70.00%    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage     50.00%    
Other Postretirement Benefit Plan, Defined Benefit          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Benefit Obligation     $ 2,300,000 2,400,000  
Foreign Defined Benefit Plan, Net Periodic Benefit Cost     (200,000) (300,000) (100,000)
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year     $ 200,000    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate     6.50%    
Defined Benefit Plan Health Care Cost Trend Rate In Future Period     5.00%    
Other Current Liabilities and Other Long-term Liabilities [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Deferred Compensation Liability, Current and Noncurrent     $ 14,500,000 15,700,000  
401(k) [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay     8.00%    
Defined Contribution Plan, Cost     $ 1,100,000 1,400,000 2,700,000
Maximum Percentage Of Core Contributions Made By Employer     3.00%    
Defined Benefit Plan, Plan Assets, Contributions by Employer     $ 0.50    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount     1    
Supplemental Executive Retirement Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Benefit Obligation     1,300,000 1,300,000  
Defined Contribution Plan, Cost     100,000 300,000 400,000
Restoration Plan [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Contribution Plan, Cost         100,000
Domestic Plan Member          
Defined Benefit Plan Disclosure [Line Items]          
Amount of benefits expected to be paid in fiscal 2022     2,900,000    
Amount of benefits expected to be paid in fiscal 2023     3,100,000    
Amount of benefits expected to be paid fiscal 2026 through fiscal 2031     14,500,000    
Defined Benefit Plan, Benefit Obligation     47,147,000 49,640,000 47,400,000
Foreign Defined Benefit Plan, Net Periodic Benefit Cost     $ 868,000 $ 773,000 $ 476,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     2.55% 2.40% 2.90%
Accumulated Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Tax     $ (19,500,000) $ (21,400,000)  
Defined Benefit Plan, Expected Amortization, Next Fiscal Year     $ 1,200,000    
Defined Benefit Plan, Expected Long Term Rate Of Returns On Assets Assumption     5.45%    
Defined Benefit Plan, Plan Assets, Benefits Paid $ 600,000   $ 2,920,000 3,222,000  
Defined Benefit Plan, Plan Assets, Contributions by Employer     691,000 183,000  
Domestic Plan Member | Subsequent Event [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Plan Assets, Benefits Paid   $ 100,000      
Foreign Plan Member          
Defined Benefit Plan Disclosure [Line Items]          
Amount of benefits expected to be paid in fiscal 2022     300,000    
Amount of benefits expected to be paid in fiscal 2023     300,000    
Amount of benefits expected to be paid in fiscal 2024     300,000    
Amount of benefits expected to be paid in, fiscal 2025     300,000    
Amount of benefits expected to be paid fiscal 2026 through fiscal 2031     2,200,000    
Defined Benefit Plan, Benefit Obligation     14,421,000 14,297,000 $ 15,103,000
Foreign Defined Benefit Plan, Net Periodic Benefit Cost     $ 110,000 $ (443,000) $ 504,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate     1.30% 1.40%  
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year     $ 0    
Defined Benefit Plan, Expected Long Term Rate Of Returns On Assets Assumption     3.90%    
Defined Benefit Plan, Plan Assets, Benefits Paid     $ 293,000 $ 300,000  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment     0 (1,687,000)  
Defined Benefit Plan, Plan Assets, Contributions by Employer     56,000 $ 323,000  
Foreign Plan Member | Other Expense [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment     700,000    
Foreign Plan Member | Other Comprehensive Income (Loss) [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment     $ (1,000,000)    
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%