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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, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | $ 3,401 | $ 4,173
Financial Liabilities | 3,892 | 4,743
Trading securities held in deferred compensation plan [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 3,313 | 4,077
Cash surrender value of life insurance policies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 88 | 96
Deferred compensation plans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities | 3,681 | 4,399
Interest rate swap derivative [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities | 211 | 344
Level 1 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 3,313 | 4,077
Level 1 [Member] | Trading securities held in deferred compensation plan [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 3,313 | 4,077
Level 2 [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 88 | 96
Financial Liabilities | 3,892 | 4,743
Level 2 [Member] | Cash surrender value of life insurance policies [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Assets | 88 | 96
Level 2 [Member] | Deferred compensation plans [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities | 3,681 | 4,399
Level 2 [Member] | Interest rate swap derivative [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Financial Liabilities | $ 211 | $ 344

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