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Related Party Transactions	12 Months Ended
Related Party Transactions	Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions WBA owns more than 10% of the Company's outstanding common stock and is, therefore, considered a related party. The Company operates under various agreements and arrangements with WBA, including a pharmaceutical distribution agreement pursuant to which the Company distributes pharmaceutical products to WBA and an agreement that provides the Company the ability to access favorable economic pricing and generic products through a generic purchasing services arrangement with Walgreens Boots Alliance Development GmbH. Both of these agreements expire in 2026. Revenue from the various agreements and arrangements with WBA was $45.4 billion, $43.4 billion, and $40.5 billion in the fiscal years ended September 30, 2017, 2016, and 2015, respectively. The Company's receivable from WBA, net of incentives, was $5.0 billion and $4.0 billion as of September 30, 2017 and 2016, respectively.