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Credit facilities (Narrative) (Details) CAD in Millions, $ in Millions	Oct. 03, 2016 USD ($)	Sep. 26, 2016 USD ($)	Mar. 30, 2017 USD ($)	Feb. 11, 2016 USD ($)	Nov. 10, 2015 USD ($)	Aug. 07, 2013 USD ($)	Aug. 07, 2013 CAD
Subordinated Secured Credit Facility [Member]
Disclosure of detailed information about borrowings [line items]
Aggregate principal amount of notes				$ 2.9
Remaining principal portion of notes				$ 1.6
Interest rate				10.00%	12.00%
Subordinated, secured credit agreement, principal amount					$ 1.0
Repayment of principal of subordinated facility	$ 1.3	$ 0.7
RCM Credit Agreement [Member]
Disclosure of detailed information about borrowings [line items]
Aggregate principal amount of notes						$ 6.4
Remaining principal portion of notes			$ 5.6
Interest rate						12.00%	12.00%
RCM Credit Agreement [Member] | Canadian Dollar [Member]
Disclosure of detailed information about borrowings [line items]
Aggregate principal amount of notes | CAD							CAD 8.5

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-IssueDate 2017-01-01
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-URIDate 2017-03-09

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
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-URIDate 2017-03-09

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- Definition

The cash outflow for repayments of subordinated liabilities. [Refer: Subordinated liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_17&doctype=Standard
-URIDate 2017-03-09

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Balance Type:	credit
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- Definition

The amount of loans received from banks that have been secured by collateral. [Refer: Loans received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
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-URIDate 2017-03-09

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Balance Type:	credit
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X

- Definition

Remaining principal portion of notes.

+ References

No definition available.

+ Details

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- Details

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- Details

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