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Summary of Significant Accounting Policies - Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | $ 3,929 | $ 3,730
Financial Liabilities | 4,381 | 4,322
Trading Securities Held in Non-Qualified Compensation Plans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 3,867 | 3,683
Cash Surrender Value of Life Insurance Policies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 62 | 47
Non Qualified Compensation Plans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities | 4,215 | 4,119
Interest Rate Swap Derivatives [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities | 166 | 203
Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 3,867 | 3,683
Level 1 [Member] | Trading Securities Held in Non-Qualified Compensation Plans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 3,867 | 3,683
Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 62 | 47
Financial Liabilities | 4,381 | 4,322
Level 2 [Member] | Cash Surrender Value of Life Insurance Policies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 62 | 47
Level 2 [Member] | Non Qualified Compensation Plans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities | 4,215 | 4,119
Level 2 [Member] | Interest Rate Swap Derivatives [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities | $ 166 | $ 203

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