Annual report pursuant to Section 13 and 15(d)

Net Periodic Benefit Costs (Detail)

v3.19.3
Net Periodic Benefit Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Other Postretirement Benefit Plan, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation $ 3,100 $ 2,900  
Foreign Defined Benefit Plan, Net Periodic Benefit Cost 100 (100) $ (200)
UNITED STATES | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 47,400 43,280 46,806
Interest cost 1,694 1,633 1,690
Expected return on assets (2,208) (2,668) (2,867)
Amortization of actuarial loss 990 1,127 1,141
Foreign Defined Benefit Plan, Net Periodic Benefit Cost 476 92 (36)
Foreign Plan [Member] | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 15,103 13,056 13,423
Employer Service Costs 450 440 413
Interest cost 257 278 239
Expected return on assets (345) (366) (379)
Amortization of Prior Service Credit (65) (69) (61)
Amortization of actuarial loss 263 306 438
Cost of Special Events (56) 18 268
Foreign Defined Benefit Plan, Net Periodic Benefit Cost $ 504 $ 607 $ 918