Schedule of Acquisition of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Feb. 28, 2015
Rome Strip Steel
Business Acquisition [Line Items]
Total acquired identifiable intangible assets	$ 5,500
Rome Strip Steel \| Customer relationships
Business Acquisition [Line Items]
Acquired finite lived intangible assets	4,300
Useful Life (Years	10 years
Rome Strip Steel \| Non-compete agreements
Business Acquisition [Line Items]
Acquired finite lived intangible assets	1,200
Useful Life (Years	5 years
DHybrid Systems Llc
Business Acquisition [Line Items]
Total acquired identifiable intangible assets	3,788
DHybrid Systems Llc \| Technological know-how
Business Acquisition [Line Items]
Acquired finite lived intangible assets	3,100
Useful Life (Years	10 years
DHybrid Systems Llc \| Customer relationships
Business Acquisition [Line Items]
Acquired finite lived intangible assets	600
Useful Life (Years	7 years
DHybrid Systems Llc \| Backlog
Business Acquisition [Line Items]
Acquired finite lived intangible assets	88
DHybrid Systems Llc \| Backlog \| Maximum
Business Acquisition [Line Items]
Useful Life (Years	1 year
MEF
Business Acquisition [Line Items]
Total acquired identifiable intangible assets	13,600
MEF \| Technological know-how
Business Acquisition [Line Items]
Acquired finite lived intangible assets	5,100
Useful Life (Years	10 years
MEF \| Customer relationships
Business Acquisition [Line Items]
Acquired finite lived intangible assets	4,300
Useful Life (Years	7 years
MEF \| Non-compete agreements
Business Acquisition [Line Items]
Acquired finite lived intangible assets	2,400
Useful Life (Years	4 years
MEF \| Backlog
Business Acquisition [Line Items]
Acquired finite lived intangible assets	$ 1,800
MEF \| Backlog \| Maximum
Business Acquisition [Line Items]
Useful Life (Years	1 year

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

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