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Retirement Benefits - Additional Information (Detail) (USD $) | 12 Months Ended
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Average annual compensation period | Ten years |  |
Defined pension benefit plan, net periodic benefit cost | $ 940,000 |  |
Employer contributions | 300,000 | 1,000,000 |
Anticipated contribution in the next fiscal year related to pension plans | 0 |  |
Age limit of employees to be eligible for contribution | 21 years |  |
Minimum service period of employees to be eligible for contribution | 3 months |  |
Matching contributions by company | 100.00% |  |
Employee's compensation | 3.00% |  |
Companies matching contribution equal to employee's contributions | 50.00% |  |
Non-matching contribution for participants employed | 1.00% |  |
Contribution made by company | 674,000 | 659,000 | 664,000
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employee's compensation | 5.00% |  |
Contributions by employer per employee's compensation maximum | 4.00% |  |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employee's compensation | 3.00% |  |
Scenario One [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase decrease in the discount rate | 1.00% |  |
Decrease increase pension expense | 181,000 | 166,000 |
Scenario One [Member] | Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Par amount outstanding | 250,000,000 |  |
Scenario Two [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increase decrease in the discount rate | 1.00% |  |
Decrease increase pension expense | $ 151,000 | $ 143,000 |
Scenario Two [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset percentage | 70.00% | 70.00% |
Scenario Two [Member] | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, Plan asset percentage | 30.00% | 30.00% |

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- Definition Defined Benefit Plan Percentage Changes In Discount Rate + References No definition available. + Details
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- Definition Defined Contribution Plan Age Limit Of Employees To Be Eligible For Catch Up Contributions + References No definition available. + Details
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- Definition Amount of contributions made by an employer to a defined contribution plan during the fiscal period. + References No definition available. + Details
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- Definition Defined Contribution Plan Eligibility Minimum Service Period + References No definition available. + Details
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- Definition Defined Contribution Plan Employer Matching Percent Of Employee Contribution + References No definition available. + Details
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- Definition Percentage Of Non Matching Contribution To Participants + References No definition available. + Details
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- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition General information regarding defined benefit plans. A defined benefit pension plan is a plan that defines an amount of pension benefit to be provided, usually as a function of one or more factors such as age, years of service, or compensation. An other postretirement defined benefit plan is an arrangement that is mutually understood by an employer and its employees, whereby an employer undertakes to provide its employees with benefits other than pensions, after they retire in exchange for their services over a specified period of time, upon attaining a specified age while in service, or a combination of both. Any plan that is not a defined contribution plan is a defined benefit plan. General descriptive information about the employer's defined benefit plans, including employee groups covered, type of benefit formula, type of benefits, cost sharing arrangements, funding policy, types of assets held, and significant nonbenefit liabilities, if any. Also includes information pertaining to multiple employer plans, which are accounted for as single-employer plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Defined Benefit Postretirement Plan -URI http://asc.fasb.org/extlink&oid=6749240 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Defined Benefit Pension Plan -URI http://asc.fasb.org/extlink&oid=6510300 + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in the amount due to fund pension and non-pension benefits to employees, retired and disabled former employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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