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Related parties
 3 Months Ended
Nov. 30, 2019
Related Party Transactions [Abstract]  
Related parties Related parties
The Company has a long-term pharmaceutical distribution agreement with AmerisourceBergen pursuant to which the Company sources branded and generic pharmaceutical products from AmerisourceBergen principally for its U.S. operations. Additionally, AmerisourceBergen receives sourcing services for generic pharmaceutical products.

Related party transactions with AmerisourceBergen (in millions):
 Three months ended November 30,
 20192018
Purchases, net$14,476  $14,322  

 November 30, 2019August 31, 2019
Trade accounts payable, net$6,422  $6,484