Debt (Narrative) (Details)	3 Months Ended	9 Months Ended
	Dec. 30, 2016 USD ($)	Dec. 30, 2016 USD ($)	Jan. 01, 2016 USD ($)	[1]	Dec. 30, 2016 AUD	Dec. 30, 2016 EUR (€)	Jul. 25, 2016 USD ($)	Apr. 01, 2016 EUR (€)
Debt Instrument [Line Items]
Debt repayments		$ 282,000,000	$ 819,000,000
Borrowings on the credit facility		920,000,000	1,300,000,000
Repayment of borrowings under credit facility		773,000,000	$ 1,300,000,000
Euro-denominated commercial paper | CSC Capital Funding Limited
Debt Instrument [Line Items]
Credit facility borrowing capacity | €						€ 1,000,000,000		€ 500,000,000
Borrowings on the credit facility		1,700,000,000
Repayment of borrowings under credit facility		1,600,000,000
Credit facility
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 250,000,000	250,000,000
Credit facility | Revolving credit facility
Debt Instrument [Line Items]
Credit facility borrowing capacity	3,020,000,000.00	3,020,000,000.00
Increase in credit facility with conditional revolver commitments		740,000,000
Credit facility borrowing capacity with conditional revolver commitments							$ 3,760,000,000.00
Repayment of borrowings under credit facility		$ 520,000,000
Term notes
Debt Instrument [Line Items]
Debt instrument, term		60 months
Loan payable, due March 2021 | Loans payable
Debt Instrument [Line Items]
Debt repayments	54,000,000
Debt borrowings	50,000,000
Term loan credit facility maturing July 2021 | Credit facility | Revolving credit facility
Debt Instrument [Line Items]
Borrowings on the credit facility		$ 920,000,000
Debt face amount | AUD					AUD 100,000,000
Incremental term loans | AUD					175,000,000
Loan payable, due January 2019 | Loans payable
Debt Instrument [Line Items]
Debt repayments		18,000,000
Amended Master Loan And Security Agreement | Credit facility
Debt Instrument [Line Items]
Credit facility borrowing capacity	$ 150,000,000	150,000,000
Maximum | Term loan credit facility maturing July 2021 | Credit facility | Revolving credit facility
Debt Instrument [Line Items]
Debt face amount | AUD					AUD 275,000,000
Xchanging | Credit facility | Revolving credit facility
Debt Instrument [Line Items]
Repayment of borrowings under credit facility		$ 254,000,000

[1] Certain prior year balances were adjusted for certain errors in previously issued financial statements related to income taxes and for the adoption of ASU 2016-09 related to employee stock-based compensation. See Note 20 - Reconciliation of Previously Reported Amounts.