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Summary of Restructuring Accruals and Certain Facility Closures (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Mar. 31, 2015
Restructuring Reserve [Roll Forward]  
September 30, 2014 $ 262us-gaap_RestructuringReserve
Cash Payments (262)us-gaap_PaymentsForRestructuring
March 31, 2015 0us-gaap_RestructuringReserve
Facilities charges  
Restructuring Reserve [Roll Forward]  
September 30, 2014 92us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Cash Payments (92)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
March 31, 2015 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
Employee separation  
Restructuring Reserve [Roll Forward]  
September 30, 2014 170us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
Cash Payments (170)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
March 31, 2015 $ 0us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember