Bank Indebtedness and Long-Term Debt (Narrative) (Details) € in Thousands, CAD in Thousands, $ in Thousands		3 Months Ended	4 Months Ended	5 Months Ended	7 Months Ended	9 Months Ended		10 Months Ended
	May. 08, 2014 CAD	Oct. 03, 2015 EUR (€)	Apr. 27, 2015 EUR (€)	May. 18, 2012	Jul. 27, 2012 CAD	Oct. 03, 2015 EUR (€)	Sep. 22, 2015	Oct. 30, 2015	Oct. 14, 2014 EUR (€)	Oct. 03, 2015 USD ($)	Jan. 03, 2015 EUR (€)	Jan. 03, 2015 USD ($)	Jul. 27, 2012 USD ($)
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding										$ 117,000		$ 91,410
Capital Lease Obligations										3,824		4,965
U S Line Of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding										21,390		6,263
European Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding										$ 85,257		72,191
Opta Minerals Inc [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date				May 18, 2012
Debt, Weighted Average Interest Rate		6.23%				6.23%				6.23%
Line Of Credit Facility Covenant Compliance		As described in note 1, as at June 30, 2015 and September 30, 2015, Opta Minerals was not in compliance with all of its financial covenants under its credit agreement. Failure to meet a financial covenant constitutes an event of default, unless the lenders agree to a waiver or amendment. On August 11, 2015, in respect of the June 30, 2015 default and October 30, 2015, in respect of the September 30, 2015 default, Opta Minerals obtained waivers in respect of the aforementioned covenant requirements from its lenders, provided that Opta Minerals meets certain additional financial covenants. As there is no assurance that Opta Minerals will be in compliance with all its financial covenants at all measurement dates within the next 12 months, the non-revolving term credit facility has been classified as current on the consolidated balance sheet as at October 3, 2015.				Over the last several years, Opta Minerals has periodically breached certain financial covenants under its credit agreement with a syndicate of lenders, including as at June 30, 2015 and September 30, 2015. As described in note 7, Opta Minerals obtained waivers from the lenders on August 11, 2015 in respect of the June 30, 2015 default and October 30, 2015, in respect of the September 30, 2015 default. In connection with these waivers, certain additional covenants were added from the date of the waivers through November 30, 2015. In addition, the lenders agreed to extend the maturity of Opta Minerals’ revolving term credit facility to November 30, 2015. Opta Minerals will require the continued support of its current financial lenders and, effective November 30, 2015, Opta Minerals will require another extension of its revolver and an additional waiver on future covenants, if breached, or an alternative source of financing. There can be no assurance that a further extension and additional waiver will be provided or that alternative sources of financing on terms favorable to Opta Minerals could be obtained to finance its operations and meet its obligations.
Opta Minerals Inc [Member] | Cad Line Of Credit [Member]
Debt Instrument [Line Items]
Line Of Credit Facility Amendment Date	May 08, 2014
Line of Credit Waiver for Covenant Requirements	Aug. 11, 2015							Oct. 30, 2015
Opta Minerals Inc [Member] | Cad Line Of Credit [Member] | USD
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding										$ 10,353		12,956
Opta Minerals Inc [Member] | Maximum [Member] | Cad Line Of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	5.50%
Opta Minerals Inc [Member] | Minimum [Member] | Cad Line Of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Organic Corporation [Member] | European Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate		2.44%				2.44%				2.44%
Organic Corporation [Member] | European Revolving Credit Facility [Member] | EUR
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date									Oct. 14, 2014
Line of Credit Facility, Maximum Borrowing Capacity | €									€ 92,500
Line of Credit Facility, Amount Outstanding | €		€ 76,094				€ 76,094					€ 58,205
Debt Instrument, Description of Variable Rate Basis									Interest costs under the Club Facility accrue based on the aggregate of: (i) a fixed loan margin of 1.75%; and (ii) a variable rate based on LIBOR or EURIBOR plus an applicable spread as set by the Lenders on a periodic basis.
Organic Corporation [Member] | European Revolving Credit Facility [Member] | USD
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding										$ 85,257		69,869
Organic Corporation [Member] | European Revolving Credit Facility [Member] | Bulgaria Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date			May 22, 2013
Syndicate Lending Group [Member]
Debt Instrument [Line Items]
Line Of Credit Facility Amendment Date							Sep. 22, 2015
Line of Credit Facility, Expiration Date					Jul. 27, 2016
Debt, Weighted Average Interest Rate		2.08%				2.08%				2.08%
Line Of Credit Facility Amended Expiration Date							Jan. 27, 2017
Syndicate Lending Group [Member] | USD
Debt Instrument [Line Items]
Line of Credit Facility, Initiation Date					Jul. 27, 2012
Syndicate Lending Group [Member] | Maximum [Member] | Cad Line Of Credit [Member] | CAD
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | CAD					CAD 10,000
Syndicate Lending Group [Member] | Maximum [Member] | U S Line Of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					2.50%
Syndicate Lending Group [Member] | Maximum [Member] | U S Line Of Credit [Member] | USD
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity													$ 165,000
Syndicate Lending Group [Member] | Maximum [Member] | Accordion Option [Member] | USD
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity													$ 50,000
Syndicate Lending Group [Member] | Minimum [Member] | U S Line Of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.75%
Non Revolving Term Credit Facility [Member] | Opta Minerals Inc [Member] | Cad Line Of Credit [Member] | CAD
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Date	May 18, 2017
Debt Instrument, Frequency of Periodic Payment	quarterly
Debt Instrument, Periodic Payment, Principal | CAD	CAD 1,312
Non Revolving Term Credit Facility [Member] | Opta Minerals Inc [Member] | Maximum [Member] | CAD
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | CAD	CAD 52,500
Revolving Acquisition Facility [Member] | Opta Minerals Inc [Member] | Cad Line Of Credit [Member] | CAD
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Date	Aug. 14, 2015
Line Of Credit Facility Amended Expiration Date	Nov. 30, 2015
Revolving Acquisition Facility [Member] | Opta Minerals Inc [Member] | Maximum [Member] | CAD
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | CAD	CAD 20,000
Working Capital [Member] | Organic Corporation [Member] | European Revolving Credit Facility [Member] | EUR
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | €									€ 80,000
Working Capital [Member] | Organic Corporation [Member] | European Revolving Credit Facility [Member] | Bulgaria Loan [Member]
Debt Instrument [Line Items]
Line Of Credit Facility Amendment Date			Apr. 27, 2015
Debt Instrument, Description of Variable Rate Basis			EURIBOR
Debt Instrument, Maturity Date			Apr. 30, 2016
Working Capital [Member] | Organic Corporation [Member] | European Revolving Credit Facility [Member] | Bulgaria Loan [Member] | Euro Interbank Offered Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.75%
Working Capital [Member] | Organic Corporation [Member] | European Revolving Credit Facility [Member] | Bulgaria Loan [Member] | EUR
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | €			€ 4,500
Line of Credit Facility, Amount Outstanding | €		€ 0				€ 0					€ 1,934
Working Capital [Member] | Organic Corporation [Member] | European Revolving Credit Facility [Member] | Bulgaria Loan [Member] | USD
Debt Instrument [Line Items]
Line of Credit Facility, Amount Outstanding										$ 0		$ 2,322
Commodity Hedging [Member] | Organic Corporation [Member] | European Revolving Credit Facility [Member] | EUR
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | €									5,000
Stand by Letters Of Credit [Member] | Organic Corporation [Member] | European Revolving Credit Facility [Member] | EUR
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | €									5,000
Currency Hedging [Member] | Organic Corporation [Member] | European Revolving Credit Facility [Member] | EUR
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | €									€ 2,500