Restructuring and Other Charges, net (By Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Document Period End Date			Mar. 31, 2019
Restructuring charges	$ (10,190)	$ (5,067)	$ (20,579)	$ (10,383)
Restructuring Charges and Other Expenses	21,469	8,881	44,550	22,450
Healthcare
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2,985)	(788)	(4,591)	(3,326)
Restructuring Charges and Other Expenses	2,985	788	4,591	3,326
Enterprise
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2,700)	(272)	(5,264)	(2,894)
Restructuring Charges and Other Expenses	2,700	272	5,264	2,894
Automotive
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(3,212)	(849)	(7,538)	(1,000)
Restructuring Charges and Other Expenses	11,611	849	20,051	1,000
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	116	(1,653)	(914)	(1,913)
Restructuring Charges and Other Expenses	445	1,653	3,981	1,913
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(1,409)	(1,505)	(2,272)	(1,250)
Restructuring Charges and Other Expenses	3,728	5,319	10,663	13,317
Personnel
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(9,945)	(3,704)	(18,428)	(7,364)
Personnel | Healthcare
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2,971)	(788)	(4,450)	(3,301)
Personnel | Enterprise
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(2,700)	(265)	(5,251)	(527)
Personnel | Automotive
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(3,593)	(849)	(5,863)	(1,000)
Personnel | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	116	(1,095)	(914)	(1,344)
Personnel | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(797)	(707)	(1,950)	(1,192)
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(245)	(1,363)	(2,151)	(3,019)
Facilities | Healthcare
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(14)	0	(141)	(25)
Facilities | Enterprise
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	(7)	(13)	(2,367)
Facilities | Automotive
Restructuring Cost and Reserve [Line Items]
Restructuring charges	381	0	(1,675)	0
Facilities | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	(558)	0	(569)
Facilities | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(612)	(798)	(322)	(58)
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Charges	11,279	3,814	23,971	12,067
Other Restructuring [Member] | Healthcare
Restructuring Cost and Reserve [Line Items]
Other Charges	0	0	0	0
Other Restructuring [Member] | Enterprise
Restructuring Cost and Reserve [Line Items]
Other Charges	0	0	0	0
Other Restructuring [Member] | Automotive
Restructuring Cost and Reserve [Line Items]
Other Charges	8,399	0	12,513	0
Other Restructuring [Member] | Other
Restructuring Cost and Reserve [Line Items]
Other Charges	561	0	3,067	0
Other Restructuring [Member] | Corporate
Restructuring Cost and Reserve [Line Items]
Other Charges	$ 2,319	3,814	$ 8,391	12,067
Chief Executive Officer [Member] | Other Restructuring [Member] | Corporate
Restructuring Cost and Reserve [Line Items]
Other Charges		$ 2,300		$ 5,700