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Business Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Aug. 31, 2012 item | Aug. 31, 2011
Business Segment Information |  |
Number of business segments | 4 |
Business Segment Information |  |
Net sales | $ 550.5 | $ 485.5
Gross profit | 90.3 | 75.7
Aviation Supply Chain |  |
Business Segment Information |  |
Net sales | 148.7 | 161.1
Gross profit | 23.7 | 26.2
Government and Defense Services |  |
Business Segment Information |  |
Net sales | 150.6 | 150.0
Gross profit | 25.9 | 27.4
Maintenance, Repair and Overhaul |  |
Business Segment Information |  |
Net sales | 105.5 | 93.2
Gross profit | 13.0 | 10.2
Structures and Systems |  |
Business Segment Information |  |
Net sales | 145.7 | 81.2
Gross profit | $ 27.7 | $ 11.9

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + 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 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: 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 + Details
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