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Debt (Narrative) (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2017 USD ($) | Mar. 01, 2016 USD ($) | Aug. 04, 2014 USD ($) | Sep. 12, 2013 USD ($) | Jul. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Oct. 31, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loans |  |  |  |  | $ 830,000,000 | $ 830,000,000 | $ 1,111,200,000
Required minimum Interest coverage ratio |  |  |  |  |  | 3.00 |
Required maximum total leverage ratio |  |  |  |  |  | 3.75 |
Interest coverage ratio |  |  |  |  | 24.08 | 24.08 |
Total leverage ratio |  |  |  |  | 1.70 | 1.70 |
Amount available under the credit agreement |  |  |  |  | $ 645,700,000 | $ 645,700,000 |
Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage |  | 0.125% |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Commitment fee percentage |  | 0.25% |  |  |  |  |
2016 Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, potential additional borrowing capacity |  | $ 750,000,000 |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Aggregate commitment amount of credit facility |  | $ 1,000,000,000.0 |  |  |  |  |
2016 Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility, initiation date |  | Mar. 01, 2016 |  |  |  |  |
Term loans |  | $ 830,000,000 |  |  | 830,000,000 | 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% |  |  |  |  |
2016 Credit Agreement [Member] | Federal Funds Rate [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.00% |  |  |  |  |
2016 Credit Agreement [Member] | Eurodollar [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 0.75% |  |  |  |  |
Line of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, maturity date |  | Mar. 01, 2021 |  |  |  |  |
Term Loan $700M [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loans |  |  | $ 700,000,000.0 |  | 0 | 0 |
Debt instrument, maturity date |  |  | Aug. 04, 2017 |  |  |  |
Debt Instrument, Issuance Date |  |  | Aug. 04, 2014 |  |  |  |
Debt term |  |  | 3 years |  |  |  |
Repayments of Debt | $ 207,000,000 |  |  |  |  |  | 493,000,000
Term Loan $300M [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loans |  |  |  | $ 300,000,000 | 0 | $ 0 |
Debt instrument, maturity date |  |  |  | Sep. 12, 2018 |  |  |
Debt Instrument, Issuance Date |  |  |  | Sep. 12, 2013 |  |  |
Debt term |  |  |  | 5 years |  |  |
Repayments of Debt |  |  |  |  | $ 285,000,000 |  | $ 15,000,000
Amortization of term loan principal |  |  |  | 5.00% |  |  |
Debt instrument, date of first required payment |  |  |  | Oct. 31, 2016 |  |  |
Medium-term Notes [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.00% |
Medium-term Notes [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.50% |
Medium-term Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.75% |
Medium-term Notes [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.50% |

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- Definition Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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