Share - Based Compensation Share Based Compensation 1 (Details) $ in Thousands	12 Months Ended
Jun. 30, 2018 USD ($)
Schedule Of Unrecognized Compensation Cost Nonvested Awards Table Text Block [Line Items]
Total unrecognized compensation costs under award programs	$ 9,184
Expected Period for Recognition	2 years 1 month
Stock Options and Stock Appreciation Rights [ Member]
Schedule Of Unrecognized Compensation Cost Nonvested Awards Table Text Block [Line Items]
Total unrecognized compensation costs under award programs	$ 3,729
Expected Period for Recognition	2 years 6 months
Performance Shares [Member]
Schedule Of Unrecognized Compensation Cost Nonvested Awards Table Text Block [Line Items]
Total unrecognized compensation costs under award programs	$ 3,282
Expected Period for Recognition	1 year 8 months
Restricted stock and Restricted Stock units [Member]
Schedule Of Unrecognized Compensation Cost Nonvested Awards Table Text Block [Line Items]
Total unrecognized compensation costs under award programs	$ 2,173
Expected Period for Recognition	1 year 11 months

[Line Items] for Schedule Of Unrecognized Compensation Cost Nonvested Awards Table Text Block [Table]

No definition available.

Name:	ait_ScheduleOfUnrecognizedCompensationCostNonvestedAwardsTableTextBlockLineItems
Namespace Prefix:	ait_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_AwardTypeAxis=ait_StockOptionsAndStockAppreciationRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=ait_RestrictedStockAndRestrictedStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: