Note 5. Fair value and carrying value of partnership interest (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2014	Sep. 25, 2013	Sep. 24, 2014
Fair Value
Fair value of partnership interest, beginning	$ 620,811	$ 54,608	$ 455,297
Investment partnership gains	156,088	23,053	1,436
Contribution of cash and securities (net of distributions) to investment partnership		377,636	164,078
Increase in proportionate share of Company stock held	0	0	0
Partnership interest, ending	776,899	455,297	620,811
Company Common Stock
Fair value of partnership interest, beginning	63,573	43,580	57,598
Investment partnership gains	11,386	2,985	(12,619)
Contribution of cash and securities (net of distributions) to investment partnership		0	0
Increase in proportionate share of Company stock held	3,958	11,033	18,594
Partnership interest, ending	78,917	57,598	63,573
Carry Value
Fair value of partnership interest, beginning	557,238	11,028	397,699
Investment partnership gains	144,702	20,068	14,055
Contribution of cash and securities (net of distributions) to investment partnership		377,636	164,078
Increase in proportionate share of Company stock held	(3,958)	(11,033)	(18,594)
Partnership interest, ending	$ 697,982	$ 397,699	$ 557,238