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2404406 - Disclosure - Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail)
(http://gencorp.com/role/IncomeTaxesSummaryOfDeferredTaxAssetsAndLiabilitiesDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Income Tax Disclosure [Abstract]Period [Axis]
2016-12-31
2015-12-31
Income Tax Disclosure [Abstract]
 
 
Deferred Tax Assets
 
 
Accrued estimated costs
89,100,000  
113,300,000  
Basis difference in assets and liabilities
8,500,000  
6,000,000  
Tax losses and credit carryforwards
6,500,000  
3,800,000  
Net cumulative defined benefit pension plan losses
212,900,000  
227,800,000  
Retiree medical and life insurance benefits
16,200,000  
19,600,000  
Valuation allowance
(1,700,000) 
(1,200,000) 
Total deferred tax assets
331,500,000  
 
369,300,000  
 
Deferred Tax Liabilities
 
 
Revenue recognition differences
21,700,000  
30,700,000  
Basis differences in intangible assets
17,300,000  
13,800,000  
Total deferred tax liabilities
39,000,000  
 
44,500,000  
 
Total net deferred tax assets
292,500,000  
 
324,800,000