Nature of Operations and Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
---|---|---|---|---|---|
Jun. 28, 2013
states
mi
|
Jun. 29, 2012
|
Jun. 28, 2013
states
mi
|
Jun. 29, 2012
|
Dec. 28, 2012
|
|
Background | |||||
Total number of rail route miles | 21,000 | 21,000 | |||
Rail network states number | 23 | 23 | |||
Fiscal Year | |||||
Number of weeks in fiscal quarter | P13W | P13W | P13W | P13W | |
Number of weeks in fiscal year | P52W | P52W | |||
Allowance for Doubtful Accounts | |||||
Allowance for doubtful accounts | $ 40 | $ 40 | $ 36 |