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Acquisition - Assets Acquired and Liabilities Assumed (Details) (Karrys)
In Millions, unless otherwise specified
0 Months Ended
Feb. 23, 2015
USD ($)
Feb. 23, 2015
CAD
Feb. 23, 2015
USD ($)
Business Acquisition [Line Items]      
Accounts receivable     $ 3.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= core_KarryBrosLimitedMember
Inventory     3.9us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= core_KarryBrosLimitedMember
Property and equipment     2.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= core_KarryBrosLimitedMember
Liabilities     (2.1)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= core_KarryBrosLimitedMember
Total consideration $ 8.0us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= core_KarryBrosLimitedMember
10.0us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= core_KarryBrosLimitedMember