Defined benefit plan percentage changes in discount rate.

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Defined contribution plan age limit of employees to be eligible for catch up contributions.

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- Definition

Defined contribution plan contributions by employer.

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- Definition

Defined contribution plan eligibility minimum service period.

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- Definition

Defined contribution plan employer matching percent of employee contribution.

+ References

No definition available.

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- Definition

Percentage of non matching contribution to participants.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

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No definition available.

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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.

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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=58740216&loc=d3e1928-114920

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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.

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No definition available.

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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 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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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=58740216&loc=d3e1928-114920

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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=58740216&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Defined Benefit Plan
-URI http://asc.fasb.org/extlink&oid=49172387

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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.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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No definition available.

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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=56944662&loc=d3e3602-108585

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Retirement Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Average annual compensation period	Ten years
Defined pension benefit plan, net periodic benefit cost	$ 1,230,000
Employer contributions	64,000	$ 775,000
Anticipated contribution in the next fiscal year related to pension plans	$ 555,000
Increase decrease in the discount rate	1.00%	1.00%
Decrease increase pension expense	$ 165,000	$ 160,000
Age limit of employees to be eligible for contribution	21 years
Minimum service period of employees to be eligible for contribution	3 months
Employee's compensation	3.00%
Non-matching contribution for participants employed	1.00%
Contribution made by company	$ 1,057,000	$ 834,000	$ 674,000
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching contributions by company	100.00%
Contributions by employer per employee's compensation	5.00%
Employee's compensation	4.00%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Matching contributions by company	50.00%
Contributions by employer per employee's compensation	3.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset percentage	75.00%	70.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset percentage	25.00%	30.00%
Yield Curve Technique [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase decrease in the discount rate	1.00%	1.00%
Decrease increase pension expense	$ 248,000	$ 176,000
Yield Curve Technique [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Par amount outstanding	$ 250,000,000