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Acquisitions Radar Industries Inc. (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 1 Months Ended
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Sep. 30, 2014
Business Acquisition [Line Items]                        
Finite-Lived Intangible Assets, Gross $ 25,710us-gaap_FiniteLivedIntangibleAssetsGross       $ 18,954us-gaap_FiniteLivedIntangibleAssetsGross       $ 25,710us-gaap_FiniteLivedIntangibleAssetsGross $ 18,954us-gaap_FiniteLivedIntangibleAssetsGross $ 25,710us-gaap_FiniteLivedIntangibleAssetsGross  
Revenues 269,844us-gaap_Revenues 216,389us-gaap_Revenues 208,972us-gaap_Revenues 183,539us-gaap_Revenues 206,598us-gaap_Revenues 166,059us-gaap_Revenues 182,146us-gaap_Revenues 145,383us-gaap_Revenues        
Net income 1,027us-gaap_NetIncomeLoss 8,349us-gaap_NetIncomeLoss 8,129us-gaap_NetIncomeLoss 4,939us-gaap_NetIncomeLoss 6,456us-gaap_NetIncomeLoss 5,282us-gaap_NetIncomeLoss 7,249us-gaap_NetIncomeLoss 2,583us-gaap_NetIncomeLoss 22,444us-gaap_NetIncomeLoss 21,570us-gaap_NetIncomeLoss    
Radar Industries [Member]                        
Business Acquisition [Line Items]                        
Business Combination, Consideration Transferred                     57,874us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
 
Consideration Transferred Net of Cash Acquired                       57,799shlo_BusinessCombinationsRecognizedIdentifiableAsstsAcquiredAndLiabilitiesAssumedNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Business Combinations, Recognized Identifiable Assets Acquired And Liabilities Assumed, Cash In Escrow                       6,500shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashInEscrow
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Cash and cash equivalents                       75shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndCashEquivalents
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Accounts receivable                       14,374shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsReceivable
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Inventory                       15,630us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Prepaid assets and other                       95shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPrepaidAssetsAndOther
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Property, plant and equipment                       26,612us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Intangible Assets                       13,753shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwill
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Goodwill                       5,620us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Accounts payable and other                       (18,285)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Business Combination, Consideration Transferred                       57,874us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Finite-Lived Intangible Asset, Useful Life                 15 years      
Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles Deductible for Tax Purposes                       5,620shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangiblesDeductibleForTaxPurposes
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
Revenues                     17,319us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
 
Net income                     1,089us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
 
Developed Technology Rights [Member] | Radar Industries [Member]                        
Business Acquisition [Line Items]                        
Finite-Lived Intangible Asset, Useful Life                 10 years      
Finite-Lived Intangible Assets, Gross 2,300us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
              2,300us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
  2,300us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
 
Goodwill [Member] | Radar Industries [Member]                        
Business Acquisition [Line Items]                        
Business Combinations,, Recognized Identifiable Assets Acquired And Liabilities Assumed, Goodwill Deductible for Tax Purposes                       31,136shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillDeductibleForTaxPurposes
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_GoodwillMember
Finite-Lived Intangible Asset, Useful Life                     15 years  
Customer Relationships [Member] | Radar Industries [Member]                        
Business Acquisition [Line Items]                        
Finite-Lived Intangible Asset, Useful Life                 14 years      
Finite-Lived Intangible Assets, Gross $ 3,320us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
              $ 3,320us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  $ 3,320us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_BusinessAcquisitionAxis
= shlo_RadarIndustriesMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember