Restructuring and Other Charges, net (By Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Document Period End Date	Dec. 31, 2018
Restructuring charges	$ 10,389	$ 5,316
Restructuring Charges and Other Expenses	23,081	13,569
Healthcare
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,606	2,538
Restructuring Charges and Other Expenses	1,606	2,538
Enterprise
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,564	2,622
Restructuring Charges and Other Expenses	2,564	2,622
Automotive
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,326	151
Restructuring Charges and Other Expenses	8,440	151
Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,030	260
Restructuring Charges and Other Expenses	3,537	260
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	863	(255)
Restructuring Charges and Other Expenses	6,934	7,998
Personnel
Restructuring Cost and Reserve [Line Items]
Restructuring charges	8,483	3,660
Personnel | Healthcare
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,479	2,513
Personnel | Enterprise
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,551	262
Personnel | Automotive
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,270	151
Personnel | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,030	249
Personnel | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,153	485
Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,906	1,656
Facilities | Healthcare
Restructuring Cost and Reserve [Line Items]
Restructuring charges	127	25
Facilities | Enterprise
Restructuring Cost and Reserve [Line Items]
Restructuring charges	13	2,360
Facilities | Automotive
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,056	0
Facilities | Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	11
Facilities | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(290)	(740)
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Other Charges	12,692	8,253
Other Restructuring [Member] | Healthcare
Restructuring Cost and Reserve [Line Items]
Other Charges	0	0
Other Restructuring [Member] | Enterprise
Restructuring Cost and Reserve [Line Items]
Other Charges	0	0
Other Restructuring [Member] | Automotive
Restructuring Cost and Reserve [Line Items]
Other Charges	4,114	0
Other Restructuring [Member] | Other
Restructuring Cost and Reserve [Line Items]
Other Charges	2,507	0
Other Restructuring [Member] | Corporate
Restructuring Cost and Reserve [Line Items]
Other Charges	6,071	8,253
Chief Executive Officer [Member] | Other Restructuring [Member] | Corporate
Restructuring Cost and Reserve [Line Items]
Other Charges	$ 7,200	$ 2,300