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Long-Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 0
Standby Letters of Credit
Debt Instrument [Line Items]
Long-term debt arrangement	2.8	2.8
Other Financial Institutions \| Standby Letters of Credit
Debt Instrument [Line Items]
Long-term debt arrangement	$ 1.6	$ 1.5

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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