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Defined Benefit Pension Plan (Detail) (USD $)
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Information about plan assets    
Target allocation (as a percent) 100.00%  
Actual (as a percent) 100.00%  
Equity securities
    
Information about plan assets    
Target allocation (as a percent) 70.00%  
Actual (as a percent) 45.90%  
Number of pooled funds 1  
Percentage of UK company shares 70.00%  
Percentage of international equity securities 30.00%  
Fixed-income securities
    
Information about plan assets    
Target allocation (as a percent) 30.00%  
Actual (as a percent) 53.60%  
Number of pooled funds 1  
Cash equivalents
    
Information about plan assets    
Target allocation (as a percent) 0.00%  
Actual (as a percent) 0.50%  
Defined benefit pension plan.
    
Net periodic benefit cost recognized    
Interest cost $ 1,125,000 $ 1,055,000
Expected return on plan assets (1,324,000) (1,055,000)
Total net periodic benefit cost (199,000)  
Change in benefit obligation    
Beginning balance 25,558,000 25,106,000
Interest cost 1,125,000 1,055,000
Benefits paid (1,104,000) (617,000)
Actuarial (gain)/loss 1,924,000 (33,000)
Foreign currency exchange rate changes 24,000 47,000
Ending balance 27,527,000 25,558,000
Change in plan assets    
Beginning balance at fair value 22,006,000 19,320,000
Actual return on plan assets 2,321,000 1,566,000
Benefits paid (1,104,000) (617,000)
Employer's contributions 1,727,000 1,632,000
Foreign currency exchange rate changes (4,000) 105,000
Ending balance at fair value 24,946,000 22,006,000
Underfunded status of the plan (2,581,000) (3,552,000)
Amount recorded in the consolidated balance sheet    
Accrued pension liability recorded in Accrued expenses and other current liabilities and Deferred taxes and other long-term liabilities   2,600,000
Accumulated benefit obligation (PBO) 27,527,000 25,558,000
Accumulated OCI    
Accumulated OCI at beginning of year (1,147,000) (584,000)
New actuarial (gains)/losses 927,000 (563,000)
Accumulated OCI at end of year (220,000) (1,147,000)
Estimated amounts to be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost during 2014    
Estimated amounts to be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost during next fiscal year 0  
Expected pension plan contributions over the next 10 years    
2015 1,693,000  
2016 1,693,000  
2017 1,693,000  
2018 1,693,000  
2019 425,000  
Total 7,197,000  
Actuarial assumptions used to determine the benefit obligations and the net periodic benefit cost    
Discount rate, benefit obligations (as a percent) 3.80% 4.40%
Discount rate, net periodic benefit cost (as a percent) 3.80% 4.40%
Expected return on plan assets, net periodic benefit cost (as a percent) 5.00% 5.80%
Increases to non-GMP pensions in payment accrued pre 4/6/97 (as a percent) 0.00% 0.00%
Increases to non-GMP pensions in payment accrued post 4/6/97 (as a percent) 2.30% 2.50%
Rate of increases to deferred CPI linked benefits (as a percent) 2.30% 2.50%
Rate of increases to deferred RPI linked benefits (as a percent) 3.30% 3.40%
Mortality (as a percent) 90.00%  
Long-term rate of improvement (as a percent) 1.00%  
Expected benefit payments over the next 10 years    
2015 820,000  
2016 686,000  
2017 1,092,000  
2018 822,000  
2019 831,000  
2020 through 2024 4,515,000  
Total $ 8,766,000