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Costs and Estimated Earnings in Excess of Billings, Net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012 Contracts Accounted for under Percentage of Completion	Oct. 31, 2011 Contracts Accounted for under Percentage of Completion	Oct. 31, 2012 Contracts Accounted for under Percentage of Completion	Oct. 31, 2011 Contracts Accounted for under Percentage of Completion
Costs and Estimated Earnings in Excess of Billings, Net [Line Items]
Revenues	$ 17,569	$ 15,055	$ 34,254	$ 30,994	$ 8,400	$ 9,600	$ 17,000	$ 17,900

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- Definition

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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