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Business Segment Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2012 item | Nov. 30, 2011 | Nov. 30, 2012 item | Nov. 30, 2011
Business Segment Information |  |  |  |
Number of business segments | 2 |  | 4 |
Business Segment Information |  |  |  |
Net sales | $ 512.8 | $ 482.0 | $ 1,063.3 | $ 967.5
Gross profit | 87.4 | 78.6 | 177.7 | 154.3
Aviation Services |  |  |  |
Business Segment Information |  |  |  |
Net sales | 390.8 | 376.8 | 789.0 | 773.0
Gross profit | 67.4 | 64.1 | 128.8 | 126.8
Technology Products |  |  |  |
Business Segment Information |  |  |  |
Net sales | 122.0 | 105.2 | 274.3 | 194.5
Gross profit | $ 20.0 | $ 14.5 | $ 48.9 | $ 27.5

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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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