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Commitments and Contingencies (Details) $ in Millions	Mar. 31, 2020 USD ($)	Mar. 31, 2019 contract
Commitments and Contingencies Disclosure [Abstract]
Number of contracts | contract		1
Contractual obligation | $	$ 1.8

X

- Definition

Contractual Obligation, Number of Contracts

+ References

No definition available.

+ Details

Name:	aaon_ContractualObligationNumberofContracts
Namespace Prefix:	aaon_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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