Deferred Compensation and Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | ||
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Jul. 31, 2015 |
Jul. 31, 2014 |
Apr. 30, 2015 |
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Increase in market value of the underlying COLI investments | $ 2,494 | $ 3,263 | |
| Gain on marketable securities | 665 | 2,018 | |
| Csv Of Coli Contracts | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Gross CSV | 173,600 | $ 172,300 | |
| Outstanding policy loans | 68,500 | $ 69,600 | |
| Increase in market value of the underlying COLI investments | 2,494 | 3,263 | |
| Executive Capital Accumulation Plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Company's contributions | 2,000 | $ 1,200 | |
| Deferred compensation arrangement vesting period | 4 years | ||
| Deferred compensation arrangement, expected company contribution in remainder of fiscal year | 20,000 | ||
| Gain on investment | $ 700 | $ 1,700 | |
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- Definition Cash Surrender Value of Life Insurance Gross No definition available.
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- Definition Policy Loans Payable No definition available.
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. No definition available.
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition 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. No definition available.
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. No definition available.
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- Definition The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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