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Receivables (Details) (USD $)
In Millions, unless otherwise specified
Jan. 02, 2015
Jun. 27, 2014
Receivables    
Accounts receivable $ 497.2us-gaap_AccountsReceivableGrossCurrent $ 457.9us-gaap_AccountsReceivableGrossCurrent
Unbilled costs and accrued earnings on cost-plus contracts 91.0hrs_UnbilledCostsAndAccruedEarningsOnCostPlusContracts 115.5hrs_UnbilledCostsAndAccruedEarningsOnCostPlusContracts
Receivables, gross 588.2hrs_AccountsNotesAndLoansReceivableGrossCurrent 573.4hrs_AccountsNotesAndLoansReceivableGrossCurrent
Less allowances for collection losses (6.2)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (7.3)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Receivables $ 582.0us-gaap_ReceivablesNetCurrent $ 566.1us-gaap_ReceivablesNetCurrent