Indebtedness (Revolving Credit Agreement) (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011	Mar. 23, 2012
Revolving credit agreement [Member]
Revolving Credit Agreement [Line Items]
Maximum borrowing capacity					$ 400,000,000
Additional borrowing capacity with the approval of the lenders					100,000,000
Maximum amount outstanding	220,470,000	214,045,000	220,470,000	216,180,000
Weighted-average amount outstanding	207,910,000	203,457,000	201,631,000	195,604,000
Weighted-average interest rate	1.60%	1.10%	1.50%	1.10%
Unused commitments	204,205,000		204,205,000
Revolving credit agreement [Member] | Weighted-average overnight federal fund rates [Member] | Fixed component [Member]
Revolving Credit Agreement [Line Items]
Basis spread on variable rate					0.50%
Revolving credit agreement [Member] | Weighted-average overnight federal fund rates [Member] | Variable component [Member] | Minimum [Member]
Revolving Credit Agreement [Line Items]
Basis spread on variable rate					0.00%
Revolving credit agreement [Member] | Weighted-average overnight federal fund rates [Member] | Variable component [Member] | Maximum [Member]
Revolving Credit Agreement [Line Items]
Basis spread on variable rate					0.75%
Revolving credit agreement [Member] | LIBOR [Member] | Minimum [Member]
Revolving Credit Agreement [Line Items]
Basis spread on variable rate					0.875%
Revolving credit agreement [Member] | LIBOR [Member] | Maximum [Member]
Revolving Credit Agreement [Line Items]
Basis spread on variable rate					1.75%
Swing-line loans [Member]
Revolving Credit Agreement [Line Items]
Maximum borrowing capacity					25,000,000
Letters of credit [Member]
Revolving Credit Agreement [Line Items]
Maximum borrowing capacity					25,000,000
Amount outstanding	$ 4,050,000		$ 4,050,000