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Noncontrolling interests roll forward (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]              
Balance       $ 0us-gaap_MinorityInterest $ 0us-gaap_MinorityInterest    
Additions due to acquisition of controlling interest in ISSC         52,467us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination    
Net loss attributable to noncontrolling interests (822)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (1,259)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (1,603)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest (3,684)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Other comprehensive loss attributable to noncontrolling interests         (866)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest 0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest 0us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Purchase of additional interests         32,095us-gaap_MinorityInterestDecreaseFromRedemptions    
Balance 16,372us-gaap_MinorityInterest       16,372us-gaap_MinorityInterest 0us-gaap_MinorityInterest  
Noncontrolling Interest [Member]              
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]              
Balance       0us-gaap_MinorityInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
0us-gaap_MinorityInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Additions due to acquisition of controlling interest in ISSC         52,467us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Net loss attributable to noncontrolling interests         (3,684)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Other comprehensive loss attributable to noncontrolling interests         (866)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Purchase of additional interests         31,849us-gaap_MinorityInterestDecreaseFromRedemptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Other         304mchp_Otherincreasedecreaseinnoncontrollinginterestduringperiod
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
   
Balance $ 16,372us-gaap_MinorityInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
      $ 16,372us-gaap_MinorityInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember