Settlement of Claims with U.S. Government (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2011	Oct. 01, 2010	Sep. 30, 2011	Oct. 01, 2010	Jul. 01, 2011
Settlement of Claims with U.S. Government [Abstract]
Cash received under definitive settlement agreement with the U.S. Government in its contract claims asserted under the Contract Disputes Act of 1978	$ 277,000,000
Contract extension received under definitive settlement agreement with the U.S. Government in its contract claims asserted under the Contract Disputes Act of 1978 (in years)	5Y
Contract extension received under definitive settlement agreement with the U.S. Government in its contract claims asserted under the Contract Disputes Act of 1978, base years (in years)	4Y
Contract extension received under definitive settlement agreement with the U.S. Government in its contract claims asserted under the Contract Disputes Act of 1978, optional year (in years)	1Y
Estimated value of contract extension	1,000,000,000		1,000,000,000
Total pre-tax charge to write down claim related assets	269,000,000		269,000,000
Amount unbilled of accounts receivable related to claims filed					379,000,000
Pre-tax charge to write down claim related assets recorded as a reduction of revenue	42,000,000		42,000,000
Pre-tax charge to write down claim related assets recorded as a separately itemized charge to cost of services	227,000,000	0	227,000,000	0
Amount of deferred costs related to claims filed					227,000,000
Estimated fair value of the contract extension	45,000,000		45,000,000
Previously unapplied payments on claim related assets					15,000,000
Fair value of the contract extension, amortization period (in years)			4Y
Term of original contract awarded (in years)			10Y
Extension granted to term of original contract awarded (in years)			2Y
Number of claims outstanding against Federal Government (in claims)					14
Original amount of claims filed, against US Federal Government					858,000,000
Forums available for litigation of Contract Disputes Act of 1978 claims					2
Partial payment received against claims					35,000,000
Amended claim amount of reduction gross					35,000,000
Number of claims asserted against the U.S. Federal Government under a single contract pending before the Armed Services Board of Contracts Appeals					14
Total amount of claims outstanding, excluding unknown, against US Federal Government					$ 675,000,000