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Debt (Narrative) (Details) |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2017 USD ($) | Mar. 01, 2016 USD ($) | Jul. 31, 2018 USD ($) | Oct. 31, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Term loans |  |  | $ 2,255,000,000 | $ 830,000,000
Required minimum Interest coverage ratio |  |  | 3.00 |
Required maximum total leverage ratio |  |  | 3.75 |
Interest coverage ratio |  |  | 12.50 |
Total leverage ratio |  |  | 2.45 |
Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee percentage |  | 0.125% |  |
Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Commitment fee percentage |  | 0.25% |  |
2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, potential additional borrowing capacity |  | $ 750,000,000 |  |
Revolving Credit Facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Aggregate commitment amount of credit facility |  | $ 1,000,000,000.0 |  |
2016 Credit Agreement |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of credit facility, initiation date |  | Mar. 01, 2016 |  |
Term loans |  | $ 830,000,000 |  |
Line of credit facility interest rate margin on base rate loans percentage |  | 1.00% |  |
Line of credit facility interest rate margin on foreign currency loans percentage |  | 1.75% |  |
Amount available under the credit agreement |  |  | $ 999,500,000 |
2016 Credit Agreement | Federal Funds Rate |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.00% |  |
2016 Credit Agreement | Eurodollar |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.75% |  |
Line of Credit |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, maturity date |  | Mar. 01, 2021 |  |
Two Thousand Seventeen Term Loan Agreement | Base Rate | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 0.00%
Two Thousand Seventeen Term Loan Agreement | Base Rate | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 0.75%
Two Thousand Seventeen Term Loan Agreement | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 1.00%
Two Thousand Seventeen Term Loan Agreement | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  | 1.75%
Senior Unsecured Term Loan Agreement | Senior Notes |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Debt term | 5 years |  |  |
Debt instrument, face amount | $ 1,425,000,000.000 |  |  |
Amount outstanding on credit agreement |  |  | $ 830,000,000 |

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