Restructuring and Other Charges Activity Related to Restructuring Accruals (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 7,389	$ 3,297	$ 2,073	$ 3,475
Expenses	996	358	9,807	3,711
Payments	(2,596)	(994)	(6,091)	(4,525)
Ending Balance	5,789	2,661	5,789	2,661
Facilities and other contract termination costs
Restructuring Reserve [Roll Forward]
Beginning Balance	96	904	433	71
Expenses	0	0	25	1,205
Payments	(96)	(241)	(458)	(613)
Ending Balance	0	663	0	663
Workforce-related termination benefits
Restructuring Reserve [Roll Forward]
Beginning Balance	7,293	2,393	1,640	3,404
Expenses	996	358	9,782	2,506
Payments	(2,500)	(753)	(5,633)	(3,912)
Ending Balance	$ 5,789	$ 1,998	$ 5,789	$ 1,998