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Pension and Retirement Plans (Detail) - Components of net periodic benefit costs - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Pension:        
Pension:        
Service cost $ 10 $ 10 $ 20 $ 19
Interest cost 128 104 251 210
Expected return on plan assets (79) (65) (154) (131)
Amortization of:        
Amortization of net gain (loss) 63 90 123 180
Net periodic benefit cost 122 139 240 278
Post Retirement:        
Pension:        
Service cost 10 10 21 19
Interest cost 12 10 24 22
Amortization of:        
Amortization of net gain (loss) (4) 4 (10) 8
Net periodic benefit cost 18 24 35 49
Foreign | Pension:        
Pension:        
Service cost 10 10 20 19
Interest cost 121 93 238 188
Expected return on plan assets (79) (65) (154) (131)
Amortization of:        
Amortization of net gain (loss) 64 91 124 182
Net periodic benefit cost 116 129 228 258
Foreign | Post Retirement:        
Pension:        
Service cost 0 0 0 0
Interest cost 0 0 0 0
Amortization of:        
Amortization of net gain (loss) 0 0 0 0
Net periodic benefit cost 0 0 0 0
U.S. | Pension:        
Pension:        
Service cost 0 0 0 0
Interest cost 7 11 13 22
Expected return on plan assets 0 0 0 0
Amortization of:        
Amortization of net gain (loss) (1) (1) (1) (2)
Net periodic benefit cost 6 10 12 20
U.S. | Post Retirement:        
Pension:        
Service cost 10 10 21 19
Interest cost 12 10 24 22
Amortization of:        
Amortization of net gain (loss) (4) 4 (10) 8
Net periodic benefit cost $ 18 $ 24 $ 35 $ 49