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Debt (Narrative) (Details) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 01, 2016 USD ($) | Aug. 04, 2014 USD ($) | Sep. 12, 2013 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2017 USD ($) | Oct. 31, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Term loans |  |  |  |  | $ 1,103,800,000 | $ 1,103,800,000 | $ 1,111,200,000
Required minimum Interest coverage ratio |  |  |  |  |  | 3.00 |
Required maximum total leverage ratio |  |  |  |  |  | 3.75 |
Interest coverage ratio |  |  |  |  | 23.95 | 23.95 |
Total leverage ratio |  |  |  |  | 1.87 | 1.87 |
Amount available under the credit agreement |  |  |  |  | $ 754,800,000 | $ 754,800,000 |
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 |  |  | $ 300,000,000.000000 |  | $ 285,000,000 | $ 285,000,000 |
Debt instrument, maturity date |  |  | Sep. 12, 2018 |  |  |  |
Debt Instrument, Issuance Date |  |  | Sep. 12, 2013 |  |  |  |
Debt term |  |  | 5 years |  |  |  |
Repayments of Debt |  |  |  |  |  |  | $ 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% |
Subsequent Event [Member] | Term Loan $300M [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Repayments of Debt |  |  |  | $ 285,000,000 |  |  |

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