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Related parties (Tables)
12 Months Ended
Aug. 31, 2019
Related Party Transactions [Abstract]  
Schedule of related party transactions
Related party transactions with AmerisourceBergen (in millions):
 
 
2019
 
2018
 
2017
Purchases, net
 
$
57,429

 
$
53,161

 
$
43,571

 
 
 
 
 
 
 
Trade accounts payable, net
 
$
6,484

 
$
6,274

 
$
4,384