Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Loss and Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail)

v2.4.1.9
Accumulated Other Comprehensive Loss and Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 04, 2015
Dec. 31, 2014
Equity [Abstract]    
Foreign Currency Translation Adjustments $ (7,000)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ (3,354)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Retirement Liability Adjustment - Before Tax (12,975)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax (13,223)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
Tax Benefit 4,541atro_AccumulatedOtherComprehensiveIncomeLossRetirementLiabilityTaxBenefit 4,628atro_AccumulatedOtherComprehensiveIncomeLossRetirementLiabilityTaxBenefit
Retirement Liability Adjustment - After Tax (8,434)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (8,595)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
Accumulated Other Comprehensive Loss $ (15,434)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (11,949)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax