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Commitments and Contingencies (Tables) | 12 Months Ended
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Apr. 30, 2014
Commitments And Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Lease Payments under Non-Cancellable Operating Leases | Future minimum lease payments under non-cancellable operating leases as of April 30, 2014 are as follows:
2015 |  | $ | 11,279 |
2016 |  |  | 10,175 |
2017 |  |  | 9,453 |
2018 |  |  | 9,678 |
2019 |  |  | 11,723 |
Thereafter |  |  | 98,562 |
Total minimum lease payments |  | $ | 150,870 |
Schedule of Total Expected Environmental Remediation Payments for Succeeding Year | The total expected environmental remediation payments, in today’s dollars, for each of the five succeeding fiscal years and the aggregate amount thereafter are as follows:
2015 |  | $ | 45 |
2016 |  |  | 3,399 |
2017 |  |  | 1,029 |
2018 |  |  | 27 |
2019 |  |  | 42 |
Thereafter |  |  | 750 |
Total |  | $ | 5,292 |
Reconciliation of Expected Aggregate Uninflated, Undiscounted Environmental Remediation Liability to Amount Recognized in Statement of Financial Position | A reconciliation of the expected aggregate uninflated, undiscounted environmental remediation liability to the amount recognized in the statement of financial position as of April 30, 2014 is as follows:
Undiscounted liability |  | $ | 5,292 |
Plus inflation / (discount) |  |  | 28 |
Liability balance – April 30, 2014 |  | $ | 5,320 |

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- Definition Tabular disclosure of future environmental remediation payments as of the latest balance sheet presented, in aggregate and for each of the five succeeding fiscal years and thereafter. + References No definition available. + Details
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- Definition Reconciliation of the environmental remediation liability to the undiscounted environmental remediation liability as of the latest balance sheet date. + References No definition available. + Details
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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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