Note 5. Fair value and carrying value of partnership interest (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 25, 2013	Sep. 24, 2014
Fair Value
Fair value of partnership interest, beginning	$ 54,608	$ 455,297
Investment partnership gains	23,053	1,436
Contribution of cash and securities (net of distributions of $10,340) to investment partnership	377,636	164,078
Increase in proportionate share of Company stock held	0	0
Partnership interest, ending	455,297	620,811
Company Common Stock
Fair value of partnership interest, beginning	43,580	57,598
Investment partnership gains	2,985	(12,619)
Contribution of cash and securities (net of distributions of $10,340) to investment partnership	0	0
Increase in proportionate share of Company stock held	11,033	18,594
Partnership interest, ending	57,598	63,573
Carry Value
Fair value of partnership interest, beginning	11,028	397,699
Investment partnership gains	20,068	14,055
Contribution of cash and securities (net of distributions of $10,340) to investment partnership	377,636	164,078
Increase in proportionate share of Company stock held	(11,033)	(18,594)
Partnership interest, ending	$ 397,699	$ 557,238