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Warranty Reserve - Additional Information (Detail) (USD $)	6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Apr. 30, 2013	Apr. 30, 2012	Aug. 22, 2013 M&P Shield TM
Standard Product Warranty Accrual [Line Items]
Accrued warranty	$ 7,484,000	$ 6,113,000	$ 8,423,000	$ 6,412,000	$ 370,000
Remaining cost related to recall costs	3,400,000
Warranty expense	$ 908,000	$ 1,600,000

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- Definition

Future Estimated Recall Costs.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9



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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(5))

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- Definition

The expense charged against earnings for the period pertaining to standard and extended warranties on the entity's goods and services granted to customers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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