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Schedule of Foreign Currency Contracts (Detail) (Foreign Exchange Contract)
In Thousands, unless otherwise specified
Apr. 30, 2015
USD ($)
Apr. 30, 2015
Buy CNH
USD ($)
Apr. 30, 2015
Buy CNH
CNY
Apr. 30, 2015
Buy CZK
USD ($)
Apr. 30, 2015
Buy CZK
CZK
Apr. 30, 2015
Buy EUR
USD ($)
Apr. 30, 2015
Buy EUR
EUR (€)
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]              
Derivative, notional amount $ 9,865invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 $ 7,227invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_CNY
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 44,893invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_CNY
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 $ 1,245invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_CZK
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 26,352invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_CZK
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 $ 1,393invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_EUR
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 € 1,072invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_EUR
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember