Benefit plans.

Name:	ait_BenefitPlansTextualsAbstract
Namespace Prefix:	ait
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Defined Contribution Plan Profit Sharing Percentage Of Income Before Income Taxes.

+ Details

Name:	ait_DefinedContributionPlanProfitSharingPercentageOfIncomeBeforeIncomeTaxes
Namespace Prefix:	ait
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum period of monthly payment of retirement benefits to retirees of acquired companies.

+ Details

Name:	ait_MaximumPeriodOfMonthlyPaymentOfRetirementBenefitsToRetireesOfAcquiredCompanies
Namespace Prefix:	ait
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of defined contribution plan by plan participants.

+ Details

Name:	ait_PercentageOfDefinedContributionPlanByPlanParticipants
Namespace Prefix:	ait
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph s

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph d

+ Details

Name:	us-gaap_DefinedBenefitPlanAmortizationOfNetGainsLosses
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanAmortizationOfNetPriorServiceCostCredit
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph g

+ Details

Name:	us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph l

+ Details

Name:	us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The date(s) used to measure (at least the majority of) plan assets and benefit obligations for defined benefit pension and other postretirement benefit plans. Disclosure required by FAS 132R paragraph 5k prior to being amended by FAS 158.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph k

+ Details

Name:	us-gaap_DefinedBenefitPlanMeasurementDate
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The ultimate trend rate for health care costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph l

+ Details

Name:	us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The year when the ultimate health care cost trend rate is expected to be reached.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph l

+ Details

Name:	us-gaap_DefinedBenefitPlanYearThatRateReachesUltimateTrendRate
Namespace Prefix:	us-gaap
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 11

+ Details

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

A description of the nature and effect of any significant changes affecting comparability of defined contribution plans, such as a change in the rate of employer contributions, a business combination, or a divestiture.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 11

+ Details

Name:	us-gaap_DescriptionOfNatureAndEffectOfSignificantChangesDuringPeriodAffectingComparability
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Benefit Plans (Details Textuals) (USD $) In Thousands, unless otherwise specified	12 Months Ended			18 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009	Jun. 30, 2010
Benefit Plans (Textuals) [Abstract]
Maximum period of monthly payment of retirement benefits to retirees of acquired companies	15 years
Percentage of defined contribution plan by plan participants	50.00%
Percentage of defined contribution plan	5.00%	5.00%	2.50%
Description of nature and effect of significant changes				The Company suspended the 401(k) match from January 1, 2009 to June 30, 2010
Defined contribution plan cost	$ 11,251	$ 4,891	$ 3,086
Defined Benefit Plan, Measurement Date	June 30
Assumed health care cost trend rates used in measuring the accumulated benefit obligation for retiree health care benefits	8.00%	8.50%
Assumed health care cost trend rates used in measuring the accumulated benefit obligation for retiree health care 2018 rate	5.00%
Defined benefit plan year that rate reaches ultimate trend rate	2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial gain (loss)	1,256
Estimated prior service cost	741
Expected contribution to benefit plans in 2012	4,200
Retiree Health Care Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial gain (loss)	(72)
Estimated prior service cost	139
Expected contribution to benefit plans in 2012	$ 240