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Pension and Retirement Plans (Detail) - Amounts recognized in the consolidated balance sheet - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability $ (6,508) $ (6,978)
Deferred tax 114 110
Accumulated other comprehensive income 5,298 5,769
Net amount recognized (1,096) (1,099)
Accumulated benefit obligation (14,779) (15,217)
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (5,188) (5,723)
Deferred tax 21 19
Accumulated other comprehensive income 5,264 5,731
Net amount recognized 97 27
Accumulated benefit obligation (13,459) (13,962)
Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,320) (1,255)
Deferred tax 93 91
Accumulated other comprehensive income 34 38
Net amount recognized (1,193) (1,126)
Accumulated benefit obligation (1,320) (1,255)
International    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (4,603) (5,046)
Deferred tax (1) 0
Accumulated other comprehensive income 5,251 5,713
Net amount recognized 647 667
Accumulated benefit obligation (12,874) (13,285)
International | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (4,603) (5,046)
Deferred tax (1) 0
Accumulated other comprehensive income 5,251 5,713
Net amount recognized 647 667
Accumulated benefit obligation (12,874) (13,285)
International | Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability 0 0
Deferred tax 0 0
Accumulated other comprehensive income 0 0
Net amount recognized 0 0
Accumulated benefit obligation 0 0
Domestic    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,905) (1,932)
Deferred tax 115 110
Accumulated other comprehensive income 47 56
Net amount recognized (1,743) (1,766)
Accumulated benefit obligation (1,905) (1,932)
Domestic | Pension    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (585) (677)
Deferred tax 22 19
Accumulated other comprehensive income 13 18
Net amount recognized (550) (640)
Accumulated benefit obligation (585) (677)
Domestic | Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,320) (1,255)
Deferred tax 93 91
Accumulated other comprehensive income 34 38
Net amount recognized (1,193) (1,126)
Accumulated benefit obligation $ (1,320) $ (1,255)