Credit Arrangements (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Dec. 30, 2011	Sep. 30, 2011	Sep. 27, 2011	Jul. 01, 2011	Sep. 29, 2010	Sep. 10, 2008
Credit Arrangements (Textuals)
Value of senior unsecured revolving credit arrangement			$ 250		$ 300	$ 750
Initial interest rate margin over LIBOR			1.25%
Minimum alternate interest rate margin over LIBOR			0.75%
Maximum alternate interest rate margin over LIBOR			1.75%
Interest rate margin over the federal funds rate			Higher of the federal funds rate plus 0.50 percent
LIBOR Interest rate			One Month Plus 1.00 Percent
Current interest rate margin over the base rate			0.25%
Minimum alternate interest rate margin over the base rate			0.00%
Maximum alternate interest rate margin over the base rate			0.75%
Maximum allowable percentage of consolidated total indebtedness to total capital			60.00%
Minimum required multiple of consolidated EBITDA to consolidated net interest expense			3.00
Payment failures on other debt which can trigger an event of default			In excess of $75 million
Amount of unsatisfied final judgement or orders considered an event of default			In excess of $75 million
Amount of certain ERISA liability incurrence considered an event of default			In excess of $75 million
Beneficial owner percentage of voting stock considered an event of default			25 percent or more
Line of credit facility initiation date	2011-09-27
Short-term Borrowings	$ 544.9	$ 561.0		$ 180.0