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2404403 - Disclosure - Income Taxes - Schedule of Reconciliation of U.S. Federal statutory Income Tax Rate to Effective Income Tax Rate on Earnings (Details)
(http://gencorp.com/role/IncomeTaxesScheduleOfReconciliationOfUSFederalStatutoryIncomeTaxRateToEffectiveIncomeTaxRateOnEarningsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000040888 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-12-01 - 2015-12-31
2014-12-01 - 2015-11-30
2013-12-01 - 2014-11-30
Income Tax Disclosure [Abstract]
 
 
 
 
Statutory U.S. federal income tax rate - provision (benefit)
35.00%  
35.00%  
35.00%  
35.00%  
State and local income taxes, net of U.S. federal income tax effect
(2.30%) 
4.80%  
(16.20%) 
(11.40%) 
Changes in state income tax rates
13.40%  
0.10%  
(19.00%) 
0.70%  
Reserve adjustments
(1.00%) 
(0.30%) 
(2.20%) 
0.80%  
Valuation allowance adjustments
0.00%  
0.00%  
0.00%  
(0.30%) 
Rescindable common stock interest and realized losses
0.00%  
0.00%  
0.00%  
(0.90%) 
Non-deductible convertible subordinated notes interest
2.90%  
1.20%  
(8.00%) 
(7.00%) 
Non-deductible premiums on repurchase of convertible subordinated notes
0.00%  
0.00%  
0.00%  
(64.10%) 
R&D credits
(14.10%) 
(2.80%) 
0.00%  
(4.00%) 
Retroactive change in federal tax law
0.00%  
(19.40%) 
11.60%  
0.00%  
Benefit of manufacturing deductions
1.50%  
(7.00%) 
5.80%  
4.30%  
Lobbying costs
2.70%  
0.40%  
(3.60%) 
(1.00%) 
Deferred tax adjustment
(1.30%) 
7.80%  
0.00%  
0.00%  
Other, net
1.40%  
2.40%  
(5.20%) 
(1.50%) 
Effective income tax rate - provision
38.20%  
 
22.20%  
 
(1.80%) 
 
(49.40%)