Sale of Elk Grove Village Building - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Aug. 31, 2012 sqft	Jul. 23, 2012 sqft
Discontinued Operations [Line Items]
Facility leased to Main Steel Polishing Company, Inc.		240,000
Leasable area of facility		280,000
Proceeds from sale of assets	$ 9.2
Gain on sales of assets	$ 3.2
Lease agreement with Torburn	35,000
Lease term	4 years

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration