Contractual Maturities of Debt Securities Classified as Held to Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Apr. 30, 2013
Schedule of Held-to-maturity Securities [Line Items]
Due within one year	$ 25	$ 226
Due within two years
Due within three years
Due after three years
Total Due	$ 25	$ 226

Held To Maturity Securities Debt Maturities After One Through Three Years Net Carrying Amount

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- Definition

Held to maturity securities debt maturities after three years net carrying amount.

+ References

No definition available.

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- Definition

Held to maturity securities debt maturities within three years net carrying amount.

+ References

No definition available.

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year following the latest fiscal year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 3

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-Section 50

-Paragraph 5

-Subparagraph (f)(1)

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