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Acquisitions and Investments (Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 0 Months Ended
May 13, 2014
Mar. 31, 2015
Jun. 30, 2014
Aquisition
Mar. 09, 2015
Specialized Industries LP        
Business Acquisition [Line Items]        
Total consideration for the purchase $ 193,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= alg_SpecializedIndustriesLPaportfoliocompanyofELBCapitalManagementLLCMember
     
Period for post closing adjustments from acquisition date 90 days      
Net sales from the Specialized business units   44,300,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= alg_SpecializedIndustriesLPaportfoliocompanyofELBCapitalManagementLLCMember
   
Net income from the Specialized business units   2,300,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= alg_SpecializedIndustriesLPaportfoliocompanyofELBCapitalManagementLLCMember
   
Smaller immaterial acquisitions        
Business Acquisition [Line Items]        
Total consideration for the purchase     5,594,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
 
Number of businesses acquired     2us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
 
Herder        
Business Acquisition [Line Items]        
Total consideration for the purchase       $ 4,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= alg_HerderImplementoseMaquinasAgricolasLtdaMember