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Summary of Marketable Securities (Parenthetical) (Detail) (USD $)	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014	Apr. 30, 2014
Schedule Of Marketable Securities [Line Items]
Obligations for which assets are held in trust	$ 127,800,000us-gaap_OtherDeferredCompensationArrangementsLiabilityCurrentAndNoncurrent		$ 127,800,000us-gaap_OtherDeferredCompensationArrangementsLiabilityCurrentAndNoncurrent		$ 117,600,000us-gaap_OtherDeferredCompensationArrangementsLiabilityCurrentAndNoncurrent
Recognized investment (loss) income	$ (200,000)us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	$ 1,200,000us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	$ 4,328,000us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments	$ 7,578,000us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements other than those specified elsewhere in the taxonomy.

+ References

No definition available.

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