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.

No definition available.

+ Details

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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

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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 55
-Paragraph 37
-URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464

Reference 2: 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

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- Details

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Acquisitions and Dispositions - Purchase Price Allocation of Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Oct. 08, 2014
ITC [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 130,900
ITC [Member] \| Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 119,000
Weighted - Average Life	15 years
ITC [Member] \| Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 7,100
Weighted - Average Life	15 years
ITC [Member] \| Other [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 4,800
Weighted - Average Life	5 years
Gallatin Steel Company [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets		$ 67,150
Gallatin Steel Company [Member] \| Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets		$ 58,250
Weighted - Average Life		20 years
Gallatin Steel Company [Member] \| Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets		$ 8,900
Weighted - Average Life		5 years