Trade Accounts Receivable Securitization and Sale Programs (Sales Programs Key Terms) (Details) - 12 months ended Aug. 31, 2019	CNY (¥)	USD ($)
A
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		$ 800,000,000
Notice period to cancel receivable sale agreements	15 days
B
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		150,000,000
Notice period to cancel receivable sale agreements	10 days
Program, extension period	1 year
C
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount | ¥	¥ 800,000,000
D
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		100,000,000
Notice period to cancel receivable sale agreements	30 days
E
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		50,000,000
F
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		150,000,000
Threshold period to cancel trade accounts receivable sale agreement before automatic extension	30 days
G
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		50,000,000
Notice period to cancel receivable sale agreements	15 days
H
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		100,000,000
Threshold period to cancel trade accounts receivable sale agreement before automatic extension	30 days
I
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		100,000,000
Threshold period to cancel trade accounts receivable sale agreement before automatic extension	30 days
J
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		740,000,000
Threshold period to cancel trade accounts receivable sale agreement before automatic extension	90 days
K
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Maximum Amount		$ 110,000,000
Threshold period to cancel trade accounts receivable sale agreement before automatic extension	30 days