Equity Investment RailAmerica Condensed Consolidated Statement of Cash Flows (Details) (RailAmerica [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 28, 2012	Oct. 02, 2012
RailAmerica [Member]
Net cash provided by operating activities	$ 41,897
Net cash used in investing activities	(19,804)
Net cash used in financing activities	(144)
Effect of exchange rate changes on cash and cash equivalents	(129)
Increase in cash and cash equivalents	21,820
Cash and cash equivalents, beginning of period	107,922	86,102
Cash and cash equivalents, end of period	$ 107,922	$ 86,102