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Network
2416403 - Disclosure - Benefit Plans - Projected Benefit Obligation (Details)
(http://www.blue-bird.com/role/BenefitPlansProjectedBenefitObligationDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001589526 (http://www.sec.gov/CIK)
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Pension Plan
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2015-10-04 - 2016-10-01
2014-09-28 - 2015-10-03
2013-09-29 - 2014-09-27
Change in benefit obligation
 
 
 
Projected benefit obligation balance, beginning of year
142,798,000  
142,555,000  
 
Interest cost
5,643,000  
5,707,000  
6,084,000  
Assumption changes
14,402,000  
1,246,000  
 
Actuarial gain
440,000  
394,000  
 
Benefits paid
(6,253,000) 
(7,104,000) 
 
Projected benefit obligations balance, end of year
157,030,000  
 
142,798,000  
 
142,555,000