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.

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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.

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No definition available.

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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.

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

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Amount of liabilities assumed at the acquisition date.

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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.

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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.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Acquisitions (Details Textual) - USD ($)		12 Months Ended
Acquisitions (Details Textual) - USD ($)	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