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Summary of Restructuring Accruals and Certain Facility Closures (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]  
Beginning Balance $ 1,732
Expense Additions 3,660
Cash Payments (4,727)
Ending Balance 665
Facilities charges
  
Restructuring Cost and Reserve [Line Items]  
Beginning Balance 1,732
Cash Payments (1,250)
Ending Balance 482
Employee separation
  
Restructuring Cost and Reserve [Line Items]  
Expense Additions 3,660
Cash Payments (3,477)
Ending Balance $ 183