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Acquisitions Finnveden (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 4 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
Jun. 30, 2014
Business Acquisition [Line Items]                        
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    
Finnveden [Member]                        
Business Acquisition [Line Items]                        
Business Combination, Consideration Transferred                 72,618us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
     
Consideration Transferred Net of Cash Acquired                       66,396shlo_BusinessCombinationsRecognizedIdentifiableAsstsAcquiredAndLiabilitiesAssumedNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Cash and cash equivalents                       6,222shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndCashEquivalents
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Accounts receivable                       29,744shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccountsReceivable
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Inventory                       26,858us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Prepaid expenses                       3,681us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Property, plant and equipment                       35,408us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Intangible Assets                       7,804shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwill
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Goodwill                       1,136us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Other non-current assets                       3,830shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNonCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Accounts payable and other                       36,416us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialLiabilities
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Long term liabilities                       5,649us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Business Combination, Consideration Transferred                       72,618us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
Revenues                     49,060us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
 
Net income                     (1,020)us-gaap_NetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
 
Customer Relationships [Member] | Finnveden [Member]                        
Business Acquisition [Line Items]                        
Business Combinations, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangibles Deductible for Tax Purposes                       $ 1,136shlo_BusinessCombinationsRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangiblesDeductibleForTaxPurposes
/ us-gaap_BusinessAcquisitionAxis
= shlo_FinnvedenMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite-Lived Intangible Asset, Useful Life                 10 years