Discontinued Operations (Opta Minerals Inc Narrative) (Details) - 3 months ended Apr. 06, 2016 - Opta Minerals Inc [Member] CAD in Millions, $ in Millions	CAD	USD ($)	USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	CAD 6.2		$ 4.8
Discontinued Operation Amount Of Cash Consideration On Sale	CAD 4.2	$ 3.2
Noncontrolling Interest, Ownership Percentage by Parent	66.00%		66.00%
Subordinated Promissory Note
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation Amount of Subordinated Promissory Note on Sale	CAD 2.0	$ 1.5
Debt Instrument Interest Rate Stated Percentage	2.00%		2.00%

The value of cash consideration received on disposal of dicontinued operations

No definition available.

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- Definition

The value of promissory note consideration received on disposal of dicontinued operations

+ References

No definition available.

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ 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

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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