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Pension and Retirement Plans (Detail) - Amounts recognized in the consolidated balance sheet - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability $ (14,022) $ (10,685)
Deferred tax (150) (301)
Accumulated other comprehensive income 9,124 5,561
Net amount recognized (5,048) (5,425)
Accumulated benefit obligation (21,482) (19,873)
Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (11,936) (8,678)
Deferred tax (216) (490)
Accumulated other comprehensive income 9,001 5,623
Net amount recognized (3,151) (3,545)
Accumulated benefit obligation (19,396) (17,866)
U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (2,086) (2,007)
Deferred tax 66 189
Accumulated other comprehensive income 123 (62)
Net amount recognized (1,897) (1,880)
Accumulated benefit obligation (2,086) (2,007)
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (12,765) (9,700)
Deferred tax (202) (466)
Accumulated other comprehensive income 9,027 5,634
Net amount recognized (3,940) (4,532)
Accumulated benefit obligation (20,225) (18,888)
Pension | Foreign    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (11,936) (8,678)
Deferred tax (216) (490)
Accumulated other comprehensive income 9,001 5,623
Net amount recognized (3,151) (3,545)
Accumulated benefit obligation (19,396) (17,866)
Pension | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (829) (1,022)
Deferred tax 14 24
Accumulated other comprehensive income 26 11
Net amount recognized (789) (987)
Accumulated benefit obligation (829) (1,022)
Post Retirement    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,257) (985)
Deferred tax 52 165
Accumulated other comprehensive income 97 (73)
Net amount recognized (1,108) (893)
Accumulated benefit obligation (1,257) (985)
Post Retirement | Foreign    
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
Post Retirement | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Accrued benefit liability (1,257) (985)
Deferred tax 52 165
Accumulated other comprehensive income 97 (73)
Net amount recognized (1,108) (893)
Accumulated benefit obligation $ (1,257) $ (985)