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Business Combinations Business Combinations Textuals (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	3 Months Ended
	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Jul. 01, 2014	May 01, 2014
Knox Acquisition [Member]
Business Acquisition, Percentage of Voting Interests Acquired				100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ait_KnoxAcquisitionMember
Total Consideration	$ 132,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ait_KnoxAcquisitionMember
Cash Paid at Closing				118,000ait_CashPaidatClose / us-gaap_BusinessAcquisitionAxis = ait_KnoxAcquisitionMember
Funding from Holdback Payments				14,000ait_FundingfromHoldbackPayments / us-gaap_BusinessAcquisitionAxis = ait_KnoxAcquisitionMember
Debt Instrument, Interest Rate During Period	1.50%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_BusinessAcquisitionAxis = ait_KnoxAcquisitionMember
Total assets acquired				164,600us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ait_KnoxAcquisitionMember
Rodensa & GSB Acquisition [Member]
Total Consideration	54,500us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ait_RodensaGSBAcquisitionMember
Funding from Holdback Payments				6,900ait_FundingfromHoldbackPayments / us-gaap_BusinessAcquisitionAxis = ait_RodensaGSBAcquisitionMember
Total assets acquired				21,300us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ait_RodensaGSBAcquisitionMember
Goodwill plus Intangibles Acquired				33,200ait_GoodwillplusIntangiblesAcquired / us-gaap_BusinessAcquisitionAxis = ait_RodensaGSBAcquisitionMember
Reliance Acquisition [Member]
Business Acquisition, Percentage of Voting Interests Acquired					100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = ait_RelianceAcquisitionMember
Total Consideration		179,800us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ait_RelianceAcquisitionMember
Funding from Holdback Payments					20,000ait_FundingfromHoldbackPayments / us-gaap_BusinessAcquisitionAxis = ait_RelianceAcquisitionMember
Debt Instrument, Interest Rate During Period		2.00%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_BusinessAcquisitionAxis = ait_RelianceAcquisitionMember
Total assets acquired					27,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ait_RelianceAcquisitionMember
Goodwill plus Intangibles Acquired					152,300ait_GoodwillplusIntangiblesAcquired / us-gaap_BusinessAcquisitionAxis = ait_RelianceAcquisitionMember
Funding from Canadian Cash					31,900ait_FundingfromCanadianCash / us-gaap_BusinessAcquisitionAxis = ait_RelianceAcquisitionMember
Funding From Existing Credit Facility					36,600ait_FundingFromExistingCreditFacility / us-gaap_BusinessAcquisitionAxis = ait_RelianceAcquisitionMember
Funding from New Credit Facility					100,000ait_FundingfromNewCreditFacility / us-gaap_BusinessAcquisitionAxis = ait_RelianceAcquisitionMember
Tops Acquisition [Member]
Total Consideration			17,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = ait_TopsAcquisitionMember
Funding from Holdback Payments			2,550ait_FundingfromHoldbackPayments / us-gaap_BusinessAcquisitionAxis = ait_TopsAcquisitionMember
Total assets acquired			3,900us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ait_TopsAcquisitionMember
Goodwill plus Intangibles Acquired			13,100ait_GoodwillplusIntangiblesAcquired / us-gaap_BusinessAcquisitionAxis = ait_TopsAcquisitionMember
Prudential Facility [Member]
Long-term Debt	$ 170,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = ait_PrudentialFacilityMember			$ 120,000us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = ait_PrudentialFacilityMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate				3.19%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_LongtermDebtTypeAxis = ait_PrudentialFacilityMember

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- Definition

Cash Paid at Close

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Funding from Canadian Cash

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Funding From Existing Credit Facility

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Funding from Holdback Payments

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Funding from New Credit Facility

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Goodwill plus Intangibles Acquired

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The average effective interest rate during the reporting period.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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