v3.26.1
Accrued Liabilities - Changes in Restructuring Reserve Activity (Details)
$ in Thousands
 9 Months Ended
Jun. 30, 2026
USD ($)
Restructuring Cost and Reserve [Line Items]  
Charges $ 16,079
Payments (3,504)
Non-cash activity (8,096)
Restructuring charges, end of period 4,479
Employee-related Costs for Severance and Other Benefits [Member] | China On-Highway Business [Member]  
Restructuring Cost and Reserve [Line Items]  
Charges 6,057
Payments (2,836)
Non-cash activity (255)
Restructuring charges, end of period 2,966
Employee-related Costs for Severance and Other Benefits [Member] | Servo-valve Transition [Member]  
Restructuring Cost and Reserve [Line Items]  
Charges 1,513
Restructuring charges, end of period 1,513
Inventory Write-downs [Member] | China On-Highway Business [Member]  
Restructuring Cost and Reserve [Line Items]  
Charges 3,836
Non-cash activity (3,836)
Property, Plant, and Equipment Write-downs [Member] | China On-Highway Business [Member]  
Restructuring Cost and Reserve [Line Items]  
Charges 4,005
Non-cash activity (4,005)
Other [Member] | China On-Highway Business [Member]  
Restructuring Cost and Reserve [Line Items]  
Charges 308
Payments (308)
Other [Member] | Servo-valve Transition [Member]  
Restructuring Cost and Reserve [Line Items]  
Charges 360
Payments $ (360)