Recently Issued Accounting Standards - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 31, 2020	Nov. 01, 2019	Aug. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating right-of-use assets	$ 130,060
Operating lease liabilities	134,272
ASU 2016-02 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating right-of-use assets	130,059	$ 130,583
Operating lease liabilities	$ 134,271	$ 134,853
New Accounting Guidance Issued and Not Yet Adopted [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Defined benefit plan effect of percentage change in assumed health care cost trend rates			1.00%