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Pension and Retirement Plans (Detail) - Fair value of the assets held by the UK pension plan by asset category - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value $ 8,239 $ 7,629
Fair Value Measurements Using Inputs Considered as Level I    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value 8,239 7,629
Fair Value Measurements Using Inputs Considered as Level II    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value 0 0
Fair Value Measurements Using Inputs Considered as Level III    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value 0 0
Cash on deposit    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value 62 86
Cash on deposit | Fair Value Measurements Using Inputs Considered as Level I    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value 62 86
Cash on deposit | Fair Value Measurements Using Inputs Considered as Level II    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value 0 0
Cash on deposit | Fair Value Measurements Using Inputs Considered as Level III    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value 0 0
Pooled funds    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value 8,177 7,543
Pooled funds | Fair Value Measurements Using Inputs Considered as Level I    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value 8,177 7,543
Pooled funds | Fair Value Measurements Using Inputs Considered as Level III    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets fair value $ 0 $ 0