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Net income per share - Narrative (Details) - Convertible Senior Notes - 2028 Notes - USD ($) $ in Millions	Aug. 31, 2018	Aug. 24, 2018
Debt Instrument [Line Items]
Convertible senior notes, issued	$ 880	$ 880
Convertible senior notes, interest rate	2.00%	2.00%

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- Definition

Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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