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Fair Value Measurements of Defined Benefit Plan Assets (Detail) - Deferred Compensation and Pension Plans - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016
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Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 25,446 | $ 24,867
Mutual Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 25,446 | 7,990
Defined Benefit Plan Common Stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | 7,910
Corporate Bonds And Municipal Bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | 5,597
US Treasury and Government |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | 2,055
Money Market Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | 1,315
Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | 17,215
Fair Value, Inputs, Level 1 | Mutual Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | 7,990
Fair Value, Inputs, Level 1 | Defined Benefit Plan Common Stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | 7,910
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | 1,315
Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | 25,446 | 7,652
Fair Value, Inputs, Level 2 | Mutual Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets | $ 25,446 |
Fair Value, Inputs, Level 2 | Corporate Bonds And Municipal Bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | 5,597
Fair Value, Inputs, Level 2 | US Treasury and Government |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total defined benefit plan assets |  | $ 2,055

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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