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Debt - Schedule of Debt Instruments (Details)
Mar. 31, 2020
GBP (£)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]      
Long-term debt   $ 4,145,194,000 $ 4,172,892,000
Less AmerisourceBergen Corporation current portion   432,311,000 32,573,000
Total, net of current portion   3,622,387,000 4,033,880,000
Revolving credit note      
Debt Instrument [Line Items]      
Maximum borrowing capacity   75,000,000  
Long-term debt   0 0
Term loan due in 2020      
Debt Instrument [Line Items]      
Long-term debt   399,873,000 399,778,000
Overdraft facility due 2021 (£30,000)      
Debt Instrument [Line Items]      
Maximum borrowing capacity | £ £ 30,000,000    
Long-term debt   32,438,000 32,573,000
Receivables securitization facility due 2022      
Debt Instrument [Line Items]      
Maximum borrowing capacity   1,450,000,000  
Long-term debt   350,000,000 350,000,000
Multi-currency revolving credit facility due 2024      
Debt Instrument [Line Items]      
Maximum borrowing capacity   1,400,000,000  
Long-term debt   0 0
$500,000, 3.50% senior notes due 2021      
Debt Instrument [Line Items]      
Principal amount   $ 500,000,000  
Interest rate 3.50% 3.50%  
Long-term debt   $ 499,165,000 498,908,000
$500,000, 3.40% senior notes due 2024      
Debt Instrument [Line Items]      
Principal amount   $ 500,000,000  
Interest rate 3.40% 3.40%  
Long-term debt   $ 497,988,000 497,744,000
$500,000, 3.25% senior notes due 2025      
Debt Instrument [Line Items]      
Principal amount   $ 500,000,000  
Interest rate 3.25% 3.25%  
Long-term debt   $ 496,650,000 496,311,000
$750,000, 3.45% senior notes due 2027      
Debt Instrument [Line Items]      
Principal amount   $ 750,000,000  
Interest rate 3.45% 3.45%  
Long-term debt   $ 743,520,000 743,099,000
$500,000, 4.25% senior notes due 2045      
Debt Instrument [Line Items]      
Principal amount   $ 500,000,000  
Interest rate 4.25% 4.25%  
Long-term debt   $ 494,622,000 494,514,000
$500,000, 4.30% senior notes due 2047      
Debt Instrument [Line Items]      
Principal amount   $ 500,000,000  
Interest rate 4.30% 4.30%  
Long-term debt   $ 492,622,000 492,488,000
Nonrecourse debt      
Debt Instrument [Line Items]      
Long-term debt   138,316,000 167,477,000
Less AmerisourceBergen Corporation current portion   $ 90,496,000 $ 106,439,000