Summary of Restructuring Accruals and Certain Facility Closures (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2014
Restructuring Reserve [Roll Forward]
September 30, 2014	$ 262
Cash Payments	(208)
December 31, 2014	54
Facilities charges
Restructuring Reserve [Roll Forward]
September 30, 2014	92
Cash Payments	(46)
December 31, 2014	46
Employee separation
Restructuring Reserve [Roll Forward]
September 30, 2014	170
Cash Payments	(162)
December 31, 2014	$ 8