Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets - Summary of Amortization Expense for Intangible Assets for Each of Next Five Years (Detail)

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Intangible Assets - Summary of Amortization Expense for Intangible Assets for Each of Next Five Years (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 04, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Amortization expense, 2015 $ 11,100us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear
Amortization expense, 2016 10,710us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Amortization expense, 2017 10,293us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Amortization expense, 2018 9,980us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Amortization expense, 2019 9,579us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Amortization expense, 2020 $ 9,524atro_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix