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Note 2 - Acquisition (Details) (USD $)
1 Months Ended 0 Months Ended 9 Months Ended
Jun. 20, 2014
Sep. 04, 2014
Mar. 31, 2015
Jun. 30, 2014
Note 2 - Acquisition (Details) [Line Items]        
Goodwill     $ 151,783,000us-gaap_Goodwill $ 125,965,000us-gaap_Goodwill
Trademarks [Member] | MPE Aeroengines Inc. [Member]        
Note 2 - Acquisition (Details) [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets   1,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= sxi_MPEAeroenginesIncMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
   
Trademarks [Member] | Ultrafryer Systems, Inc. [Member]        
Note 2 - Acquisition (Details) [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets 2,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
     
Minimum [Member] | Ultrafryer Systems, Inc. [Member] | Other Intangible Assets [Member]        
Note 2 - Acquisition (Details) [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years      
Maximum [Member] | Ultrafryer Systems, Inc. [Member] | Other Intangible Assets [Member]        
Note 2 - Acquisition (Details) [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years      
MPE Aeroengines Inc. [Member] | Customer Relationships [Member]        
Note 2 - Acquisition (Details) [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   9,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sxi_MPEAeroenginesIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
   
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   15 years    
MPE Aeroengines Inc. [Member]        
Note 2 - Acquisition (Details) [Line Items]        
Payments to Acquire Businesses, Gross   55,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= sxi_MPEAeroenginesIncMember
   
Business Acquisition, Percentage of Voting Interests Acquired   100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sxi_MPEAeroenginesIncMember
   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   10,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= sxi_MPEAeroenginesIncMember
   
Goodwill   33,100,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sxi_MPEAeroenginesIncMember
   
Ultrafryer Systems, Inc. [Member] | Customer Relationships [Member]        
Note 2 - Acquisition (Details) [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 4,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
     
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 15 years      
Ultrafryer Systems, Inc. [Member] | Other Intangible Assets [Member]        
Note 2 - Acquisition (Details) [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
     
Ultrafryer Systems, Inc. [Member]        
Note 2 - Acquisition (Details) [Line Items]        
Payments to Acquire Businesses, Gross 23,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember
  22,986,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember
 
Business Acquisition, Percentage of Voting Interests Acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember
     
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 7,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember
  7,612,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember
 
Goodwill 11,000,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember
  $ 11,021,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sxi_UltrafryerSystemsIncMember