Amount of increase in current borrowing capacity under the credit facility considering certain circumstances.

No definition available.

Name:	air_LineOfCreditIncreaseInBorrowingCapacity
Namespace Prefix:	air_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The number of facilities acquired by the entity during the period.

+ References

No definition available.

+ Details

Name:	air_NumberOfFacilitiesAcquired
Namespace Prefix:	air_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the aggregate of total long-term debt, including current maturities and short-term debt.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LoansPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=air_CanadianDollarOfferRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financing Arrangements (Details) $ in Millions, $ in Millions	Sep. 25, 2019 USD ($)	Oct. 18, 2017 CAD ($) facility	Feb. 29, 2020 USD ($)	May 31, 2019 USD ($)
Financing Arrangements
Total debt			$ 208.1	$ 142.9
Debt issuance costs, net			(2.1)	(1.2)
Long-term debt			206.0	141.7
Number of facilities acquired \| facility		2
Term Loan
Financing Arrangements
Total debt			23.1	22.9
Maximum borrowing capacity		$ 31
CDOR \| Minimum \| Term Loan
Financing Arrangements
Basis spread on variable rate (as a percent)		1.25%
CDOR \| Maximum \| Term Loan
Financing Arrangements
Basis spread on variable rate (as a percent)		2.25%
Eurodollar rate \| Revolving Credit Facility expiring November 1, 2021 with interest payable monthly \| Minimum
Financing Arrangements
Basis spread on variable rate (as a percent)	0.875%
Eurodollar rate \| Revolving Credit Facility expiring November 1, 2021 with interest payable monthly \| Maximum
Financing Arrangements
Basis spread on variable rate (as a percent)	1.75%
Base rate \| Revolving Credit Facility expiring November 1, 2021 with interest payable monthly \| Minimum
Financing Arrangements
Basis spread on variable rate (as a percent)	0.00%
Base rate \| Revolving Credit Facility expiring November 1, 2021 with interest payable monthly \| Maximum
Financing Arrangements
Basis spread on variable rate (as a percent)	0.75%
Prime Rate \| Minimum \| Term Loan
Financing Arrangements
Basis spread on variable rate (as a percent)		0.25%
Prime Rate \| Maximum \| Term Loan
Financing Arrangements
Basis spread on variable rate (as a percent)		1.25%
Revolving credit facility
Financing Arrangements
Total debt			$ 185.0	$ 120.0
Maximum borrowing capacity	$ 900.0
Current borrowing capacity	600.0
Increase in borrowing capacity	$ 300.0