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Basis of Presentation Change in Accounting Principle (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income    $ 175us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome    $ 1,342us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
Net Sales Impact [Member] [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income       1,200us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= ait_NetSalesImpactMemberMember
Operating Income Impact [Member]        
Impact of Retrospective Adjustment       100ait_ImpactofRetrospectiveAdjustment
/ ait_AdjustmentsforChangeinAccountingPrincipleMexicoAxis
= ait_OperatingIncomeImpactMember
Net Sales Impact [Member] [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income   200us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ ait_AdjustmentsforChangeinAccountingPrincipleMexicoAxis
= ait_NetSalesImpactMemberMember
  200us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfChangeOnNetIncome
/ ait_AdjustmentsforChangeinAccountingPrincipleMexicoAxis
= ait_NetSalesImpactMemberMember
Impact of Retrospective Adjustment       1,100ait_ImpactofRetrospectiveAdjustment
/ ait_AdjustmentsforChangeinAccountingPrincipleMexicoAxis
= ait_NetSalesImpactMemberMember
Net Income Impact [Member]        
Impact of Retrospective Adjustment       $ 300ait_ImpactofRetrospectiveAdjustment
/ ait_AdjustmentsforChangeinAccountingPrincipleMexicoAxis
= ait_NetIncomeImpactMember