Consignment Inventory

No definition available.

Name:	bgc_ConsignmentInventory
Namespace Prefix:	bgc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of Consignment Inventory

+ References

No definition available.

+ Details

Name:	bgc_PercentageOfConsignmentInventory
Namespace Prefix:	bgc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

+ Details

Name:	us-gaap_ForeignCurrencyExchangeRateTranslation1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_InventoryLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28360613&loc=d3e4542-108314

+ Details

Name:	us-gaap_InventoryWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The percentage of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods.

+ References

No definition available.

+ Details

Name:	us-gaap_PercentageOfWeightedAverageCostInventory
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Inventories (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013	Dec. 31, 2013	Feb. 13, 2013	Feb. 12, 2013	Dec. 31, 2012
Inventory [Line Items]
Percentage of weighted average cost inventory	85.00%		85.00%
Inventory impairment charge	$ 8.0	$ 0
Foreign currency exchange rate, translation	6.3		6.30	6.30	4.30
Consignment inventory			$ 32.5			$ 27.3
UNITED STATES AND CANADA
Inventory [Line Items]
Consignment inventory, percentage			87.00%			92.00%
SICAD 1 Rate [Member]
Inventory [Line Items]
Foreign currency exchange rate, translation	10.8