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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 835
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-Section 45
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 14
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Debt \| Senior Notes (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
Debt \| Senior Notes (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Sep. 30, 2012	Apr. 30, 2017	Apr. 30, 2016
Debt Instrument
Proceeds from Issuance of Long-term Debt			$ 1,008,148	$ 0
Senior Notes \| 3.70% Senior Notes
Debt Instrument
Debt Instrument, Face Amount	$ 500,000		500,000
Debt Instrument, Interest Rate, Stated Percentage	3.70%
Senior Notes \| 4.95% Senior Notes
Debt Instrument
Debt Instrument, Face Amount	$ 500,000		500,000
Debt Instrument, Interest Rate, Stated Percentage	4.95%
Senior Notes \| 2017 Senior Notes
Debt Instrument
Proceeds from Issuance of Long-term Debt	$ 989,800
Debt Instrument, Unamortized Discount	1,600
Debt Issuance Costs, Gross	8,600
Senior Notes \| 3.75% Senior Notes
Debt Instrument
Debt Instrument, Face Amount	$ 350,000	$ 350,000	$ 350,000
Debt Instrument, Interest Rate, Stated Percentage		3.75%
Proceeds from Issuance of Debt		$ 345,800
Debt Instrument, Unamortized Discount		1,300
Debt Issuance Costs, Gross		$ 2,900