Restructuring and Other Charges, net (Accrual Activity Relating to Restructuring and Other Charges) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring [Roll Forward]
Balance at September 30, 2015			$ 6,857
Restructuring charges	$ 5,717	$ 7,486	20,150	$ 9,381
Restructuring Reserve, Accrual Adjustment			111
Cash payments			(13,129)
Balance at June 30, 2016	13,989		13,989
Personnel
Restructuring [Roll Forward]
Balance at September 30, 2015			635
Restructuring charges			9,410
Restructuring Reserve, Accrual Adjustment			(57)
Cash payments			(8,550)
Balance at June 30, 2016	1,438		1,438
Facilities
Restructuring [Roll Forward]
Balance at September 30, 2015			6,222
Restructuring charges			10,740
Restructuring Reserve, Accrual Adjustment			168
Cash payments			(4,579)
Balance at June 30, 2016	$ 12,551		$ 12,551