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Components of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Oct. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Apr. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Deferred compensation and benefit pension plan adjustments, net of taxes $ (16,586)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax   $ (18,006)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax      
Foreign currency translation adjustment (27,168)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax   15,604us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax      
Unrealized gains on marketable securities, net of taxes 7us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax   14us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax      
Accumulated other comprehensive loss, net $ (43,747)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (17,671)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (2,388)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (11,042)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (1,322)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (2,631)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax