Financial Instruments Financial instruments - Derivatives (Details) - USD ($)
$ in Thousands |
3 Months Ended |
6 Months Ended |
12 Months Ended |
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Apr. 30, 2016 |
Apr. 30, 2015 |
Apr. 30, 2016 |
Apr. 30, 2015 |
Mar. 31, 2017 |
Oct. 01, 2017 |
Apr. 01, 2017 |
Oct. 31, 2015 |
| Interest Rate Swap [Member] |
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Derivative, Notional Amount |
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$ 500,000
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| Foreign Exchange Forward [Member] |
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Derivative, Maturity Period (Days) |
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90 months
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| Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Derivative, Gain (Loss) on Derivative, Net |
$ (2,689)
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$ (631)
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$ 1,621
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$ 10,903
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| Derivative, Notional Amount |
184,100
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184,100
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$ 219,600
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| Term A Loan [Member] | Interest Rate Swap [Member] |
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Derivative, Amount of Hedged Item |
$ 500,000
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$ 500,000
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| Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |
1.20%
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1.20%
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| Scenario, Forecast [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net |
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$ 3,000
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| Scenario, Forecast [Member] | Term A Loan [Member] | Interest Rate Swap [Member] |
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| Derivative Instruments, Gain (Loss) [Line Items] |
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| Derivative, Amount of Hedged Item |
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$ 400,000
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$ 450,000
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