Common Unit Repurchase and Retirement - Company's Repurchase Activities (Parenthetical) (Detail) - shares shares in Millions	Apr. 30, 2023	Aug. 31, 2022	Jul. 31, 2022
Capital Unit [Line Items]
Company's common units authorized for repurchase		1.7	0.4
Common Stock Available for Repurchase Under Open Market Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase	0.8	1.4
Common Stock Available for Repurchase Under Privately Negotiated Transactions
Capital Unit [Line Items]
Company's common units authorized for repurchase	0.3	0.3