XML 114 R101.htm IDEA: XBRL DOCUMENT
v3.20.4

Selected Quarterly Financial Information - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Mar. 28, 2020 | Dec. 31, 2020
Federal |  |  |
Selected Quarterly Financial Information [Line Items] |  |  |
Valuation allowance, deferred tax asset, increase (decrease) | $ 14.1 | $ 7.0 | $ 23.3

X
- Definition Selected Quarterly Financial Information + References No definition available. + Details
Name: | atro_SelectedQuarterlyFinancialInformationLineItems
Namespace Prefix: | atro_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |