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Acquisitions (Details Textual) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2015 | Jun. 02, 2012
Business Acquisition [Line Items] |  |  |  |  |
Liabilities assumed | $ 300,000 |  |  |  |
Goodwill |  | $ 306,579,000 | $ 292,527,000 | $ 279,074,000 |
Purchase price of acquisition, net of cash |  | $ 22,679,000 | $ 60,584,000 | $ 11,518,000 |
Zalk Steel [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | 3,300,000 |  |  |  |
Purchase price of acquisition | 10,500,000 |  |  |  |
Intangible assets acquired | $ 3,400,000 |  |  |  |
Nuclear Logistics Incorporated [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Future contingent consideration |  |  |  |  | $ 20,000,000
Customer Relationships [Member] | Zalk Steel [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life |  | 19 years |  |  |
Trade Names [Member] | Zalk Steel [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life |  | 19 years |  |  |
Noncompete Agreements [Member] | Zalk Steel [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Weighted average useful life |  | 5 years |  |  |

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- Definition 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. + References 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=66006027&loc=d3e16265-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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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=73530397&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed 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=73530397&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References 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 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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