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Balance Sheet Details - Accounts Receivable and Inventory (Details) (USD $)
In Millions, unless otherwise specified
Dec. 28, 2014
Dec. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 34.7us-gaap_CashAndCashEquivalentsAtCarryingValue $ 55.7us-gaap_CashAndCashEquivalentsAtCarryingValue $ 49.0us-gaap_CashAndCashEquivalentsAtCarryingValue $ 69.6us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total current accounts receivable 250.2us-gaap_AccountsReceivableGrossCurrent 268.1us-gaap_AccountsReceivableGrossCurrent    
Allowance for doubtful accounts (2.0)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (2.3)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent    
Total current accounts receivable, net 248.2us-gaap_AccountsReceivableNetCurrent 265.8us-gaap_AccountsReceivableNetCurrent    
Total accounts receivable, net 248.2us-gaap_AccountsReceivableNet 265.9us-gaap_AccountsReceivableNet    
Retainages receivable 6.1us-gaap_ContractReceivableRetainage 6.2us-gaap_ContractReceivableRetainage    
Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract]        
Raw materials 39.8us-gaap_InventoryRawMaterialsNetOfReserves 44.5us-gaap_InventoryRawMaterialsNetOfReserves    
Work in process 22.3us-gaap_InventoryWorkInProcessNetOfReserves 24.3us-gaap_InventoryWorkInProcessNetOfReserves    
Finished goods 4.7us-gaap_InventoryFinishedGoodsNetOfReserves 4.6us-gaap_InventoryFinishedGoodsNetOfReserves    
Supplies and other 2.1us-gaap_OtherInventoryNetOfReserves 1.9us-gaap_OtherInventoryNetOfReserves    
Subtotal inventoried costs 68.9us-gaap_InventoryNet 75.3us-gaap_InventoryNet    
Less customer advances and progress payments (0.9)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms (0.7)us-gaap_ProgressPaymentsNettedAgainstInventoryForLongTermContractsOrPrograms    
Total inventoried costs 68.0us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings 74.6us-gaap_InventoryNetOfAllowancesCustomerAdvancesAndProgressBillings    
Billed        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total current accounts receivable 133.6us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_BilledRevenuesMember		 150.2us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_BilledRevenuesMember		    
Unbilled        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total current accounts receivable 116.6us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember		 117.9us-gaap_AccountsReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember		    
Unbilled, long-term (included in other assets) 0us-gaap_AccountsReceivableNetNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember		 0.1us-gaap_AccountsReceivableNetNoncurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember		    
U.S. Government        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total accounts receivable, net 40.3us-gaap_AccountsReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_GovernmentMember		 51.4us-gaap_AccountsReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_GovernmentMember		    
U.S. Government | Billed        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total accounts receivable, net 19.1us-gaap_AccountsReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_BilledRevenuesMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_GovernmentMember		 19.8us-gaap_AccountsReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_BilledRevenuesMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_GovernmentMember		    
U.S. Government | Unbilled        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total accounts receivable, net $ 21.2us-gaap_AccountsReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_GovernmentMember		 $ 31.6us-gaap_AccountsReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= us-gaap_UnbilledRevenuesMember
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis
= us-gaap_GovernmentMember