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Debt and Available Credit Facilities (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 31, 2015 | Aug. 06, 2015 | Dec. 22, 2014 | Aug. 31, 2015 | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount of financing available under credit facilities |  |  |  |  | $ 1,100,000 |  |
Debt financing costs paid |  |  |  |  | 0 | $ 3,362 | $ 0
Unused lines of credit |  |  |  |  | $ 700,000 |  |
Weighted average interest rate on total debt outstanding during the period |  |  |  |  | 2.19% | 1.88% |
Weighted average interest rate on total debt at period end |  |  |  |  | 2.74% | 2.12% |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Outstanding borrowings under revolving credit facilities |  |  |  |  | $ 365,000 | $ 605,000 |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Optional credit limit increase available on request |  |  |  |  | 350,000 |  |
Minimum increments in which optional credit limit increase may be requested |  |  |  |  | $ 50,000 |  |
Debt financing costs paid |  |  |  |  |  | 3,400 |
Term of credit facility |  |  |  |  | 5 years |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility fee percentage |  |  |  |  | 0.15% |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Line of credit facility fee percentage |  |  |  |  | 0.25% |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Applicable margin |  |  |  |  | 0.98% |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Applicable margin |  |  |  |  | 1.50% |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Applicable margin |  |  |  |  | 0.00% |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Applicable margin |  |  |  |  | 0.45% |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Federal Funds Effective Rate [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Margin rate over reference rate used in determining base rate |  |  |  |  | 0.50% |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Eurocurrency Rate [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Margin rate over reference rate used in determining base rate |  |  |  |  | 1.00% |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Previous Revolving Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount of financing available under credit facilities |  |  |  |  | $ 940,000 |  |
Line of credit facility, due date |  |  |  |  | Nov. 02, 2016 |  |
Syndicate Bank Group led by Bank of America [Member] | Revolving Credit Facility [Member] | Amended and Extended Revolving Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount of financing available under credit facilities |  |  |  |  | $ 1,100,000 |  |
Line of credit facility, due date |  |  |  |  | Mar. 01, 2021 |  |
TD Bank, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount of financing available under credit facilities | $ 50,000 |  |  |  |  |  |
Term of credit facility | 364 days |  |  |  |  |  |
Santander Bank, N.A. [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Amount of financing available under credit facilities |  | $ 100,000 | $ 50,000 |  |  |  |
Line of credit facility, due date |  | May 23, 2016 |  |  |  |  |
Line of credit facility, amount drawn |  |  |  | $ 50,000 |  |  |
Term of credit facility |  |  | 364 days |  |  |  |
Period for reinstatement of revolving credit facility |  |  | 30 days |  |  |  |
Other Credit Facilities [Member] | Line of Credit [Member] |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |
Outstanding borrowings under revolving credit facilities |  |  |  |  | $ 0 | $ 0 |
Amount of financing available under credit facilities |  |  |  |  | $ 6,800 |  |

X
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- Definition Amount drawn from the line of credit facility during the period. + References No definition available. + Details
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- Definition Period of time, after which the revolving credit facility is reinstated, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The minimum incremental amount by which the entity may request an optional increase to the maximum borrowing capacity under the revolving credit facility. + References No definition available. + Details
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- Definition The total amount by which the entity may request an optional increase to the maximum borrowing capacity under the revolving credit facility. This may consist of one request or several requests in minimum increments as specified under the revolving credit agreement. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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