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Commitments and Contingencies (Details) $ in Millions | Sep. 30, 2019 USD ($) | Sep. 30, 2018 contract
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Commitments and Contingencies Disclosure [Abstract] |  |
Number of contracts | contract |  | 1
Contractual obligation | $ | $ 3.4 |

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