Long-Term Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2014	Apr. 30, 2013
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 0
Standby Letters of Credit
Debt Instrument [Line Items]
Long-term debt arrangement	2.8	2.7
Previous Facility, restricted cash	0	2.9
Standby Letters of Credit \| Other Financial Institutions
Debt Instrument [Line Items]
Long-term debt arrangement	$ 0.2

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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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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