Funded Status of Defined Benefit Pension Plans (Detail) - USD ($) $ in Thousands	Aug. 31, 2019	Aug. 31, 2018	Aug. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 40,412	$ 40,244
Pension Plans, Defined Benefit | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amount of benefits expected to be paid in fiscal 2020	200
Amount of benefits expected to be paid in fiscal 2021	300
Amount of benefits expected to be paid in fiscal 2022	400
Amount of benefits expected to be paid in, fiscal 2023	300
Amount of benefits expected to be paid fiscal 2025 through fiscal 2027	1,900
Defined Benefit Plan, Benefit Obligation	15,103	13,056	$ 13,423
Fair value of plan assets	8,118	7,902	$ 7,904
Funded status of the plans (underfunded)	$ (6,985)	$ (5,154)