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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event In December 2016, the Company notified holders of its 4¹/₁₆% Debentures that the Company would redeem, on February 3, 2017, all of their 4¹/₁₆% Debentures at a purchase price equal to 100% of the principal amount of the 4¹/₁₆% Debentures to be redeemed, plus any accrued and unpaid interest. In January 2017, $35.6 million of the 4¹/₁₆% Debentures (the entire amount outstanding as of December 31, 2016) were converted to 3.9 million shares of common stock. On February 22, 2017, the Company announced that it signed a definitive agreement to purchase Coleman Aerospace from L3 Technologies, Inc. for $15 million in cash, subject to customary adjustments. The transaction closed on February 24, 2017. Coleman Aerospace will operate as a subsidiary of Aerojet Rocketdyne, Inc. and will be renamed Aerojet Rocketdyne Coleman Aerospace, Inc.