Supplemental Guarantor Condensed Consolidating Financials - Schedule of Consolidating Statement of Cash Flows (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	$ 376.7	$ 415.8
INVESTING ACTIVITIES
Acquisition of businesses	0	(6.3)
Payment of additional acquisition consideration	0	(16.8)
Proceeds from sale of business, net of cash transferred	2.4	86.3
Purchase of property and equipment	(30.9)	(41.1)
Increase in equipment under customer usage agreements	(26.9)	(31.9)
Net sales (purchases) of insurance contracts	13.8	(4.0)
Purchases of mutual funds	(29.7)	0
Sales of mutual funds	22.4	0
Proceeds from sale of intellectual property	0	60.0
Purchase of cost-method equity investments	0	(3.6)
Sale of a cost-method equity investment	0	2.1
Increase in other assets	(3.0)	(4.6)
Net cash (used in) provided by investing activities	(51.9)	40.1
FINANCING ACTIVITIES
Repayment of long-term debt	(578.8)	(48.8)
Payment of debt issuance costs	(2.4)	(7.0)
Payment of contingent consideration	0	(42.4)
Payment of deferred acquisition consideration	(5.0)	(1.7)
Net proceeds from issuance of common stock pursuant to employee stock plans	75.8	51.2
Excess tax benefit related to equity awards	5.2	5.4
Payment of minimum tax withholdings on net share settlements of equity awards	(9.2)	(12.0)
Intercompany dividend		0
Net cash used in financing activities	(514.4)	(55.3)
Effect of exchange rate changes on cash and cash equivalents	(0.4)	(2.6)
Net (decrease) increase in cash and cash equivalents	(190.0)	398.0
Cash and cash equivalents, beginning of period	822.5	560.4
Cash and cash equivalents, end of period	632.5	958.4
Eliminations [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	0	0
INVESTING ACTIVITIES
Acquisition of businesses		0
Payment of additional acquisition consideration		0
Proceeds from sale of business, net of cash transferred	0	0
Purchase of property and equipment	0	0
Increase in equipment under customer usage agreements	0	0
Net sales (purchases) of insurance contracts	0	0
Purchases of mutual funds	0
Sales of mutual funds	0
Proceeds from sale of intellectual property		0
Purchase of cost-method equity investments		0
Sale of a cost-method equity investment		0
Increase in other assets	0	0
Net cash (used in) provided by investing activities	0	0
FINANCING ACTIVITIES
Repayment of long-term debt	0	0
Payment of debt issuance costs	0	0
Payment of contingent consideration		0
Payment of deferred acquisition consideration	0	0
Net proceeds from issuance of common stock pursuant to employee stock plans	0	0
Excess tax benefit related to equity awards	0	0
Payment of minimum tax withholdings on net share settlements of equity awards	0	0
Intercompany dividend		0
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Parent/Issuer [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	412.6	218.4
INVESTING ACTIVITIES
Acquisition of businesses		(6.1)
Payment of additional acquisition consideration		(16.8)
Proceeds from sale of business, net of cash transferred	0	0
Purchase of property and equipment	(9.4)	(13.1)
Increase in equipment under customer usage agreements	(0.5)	(0.5)
Net sales (purchases) of insurance contracts	13.8	(4.0)
Purchases of mutual funds	(29.7)
Sales of mutual funds	22.4
Proceeds from sale of intellectual property		0
Purchase of cost-method equity investments		(3.4)
Sale of a cost-method equity investment		2.1
Increase in other assets	(1.0)	(2.1)
Net cash (used in) provided by investing activities	(4.4)	(43.9)
FINANCING ACTIVITIES
Repayment of long-term debt	(578.8)	(48.8)
Payment of debt issuance costs	(2.4)	(7.0)
Payment of contingent consideration		(42.4)
Payment of deferred acquisition consideration	(5.0)	(1.7)
Net proceeds from issuance of common stock pursuant to employee stock plans	75.8	51.2
Excess tax benefit related to equity awards	5.2	5.4
Payment of minimum tax withholdings on net share settlements of equity awards	(9.2)	(12.0)
Intercompany dividend		175.0
Net cash used in financing activities	(514.4)	(55.3)
Effect of exchange rate changes on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	(106.2)	119.2
Cash and cash equivalents, beginning of period	321.6	210.0
Cash and cash equivalents, end of period	215.4	329.2
Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	(81.1)	146.4
INVESTING ACTIVITIES
Acquisition of businesses		0
Payment of additional acquisition consideration		0
Proceeds from sale of business, net of cash transferred	0	84.8
Purchase of property and equipment	(15.3)	(19.7)
Increase in equipment under customer usage agreements	(15.8)	(18.8)
Net sales (purchases) of insurance contracts	0	0
Purchases of mutual funds	0
Sales of mutual funds	0
Proceeds from sale of intellectual property		60.0
Purchase of cost-method equity investments		(0.2)
Sale of a cost-method equity investment		0
Increase in other assets	(3.0)	(2.1)
Net cash (used in) provided by investing activities	(34.1)	104.0
FINANCING ACTIVITIES
Repayment of long-term debt	0	0
Payment of debt issuance costs	0	0
Payment of contingent consideration		0
Payment of deferred acquisition consideration	0	0
Net proceeds from issuance of common stock pursuant to employee stock plans	0	0
Excess tax benefit related to equity awards	0	0
Payment of minimum tax withholdings on net share settlements of equity awards	0	0
Intercompany dividend		(175.0)
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	0.4	(3.0)
Net (decrease) increase in cash and cash equivalents	(114.8)	247.4
Cash and cash equivalents, beginning of period	387.4	269.4
Cash and cash equivalents, end of period	272.6	516.8
Non-Guarantor Subsidiaries [Member]
OPERATING ACTIVITIES
Net cash provided by (used in) operating activities	45.2	51.0
INVESTING ACTIVITIES
Acquisition of businesses		(0.2)
Payment of additional acquisition consideration		0
Proceeds from sale of business, net of cash transferred	2.4	1.5
Purchase of property and equipment	(6.2)	(8.3)
Increase in equipment under customer usage agreements	(10.6)	(12.6)
Net sales (purchases) of insurance contracts	0	0
Purchases of mutual funds	0
Sales of mutual funds	0
Proceeds from sale of intellectual property		0
Purchase of cost-method equity investments		0
Sale of a cost-method equity investment		0
Increase in other assets	1.0	(0.4)
Net cash (used in) provided by investing activities	(13.4)	(20.0)
FINANCING ACTIVITIES
Repayment of long-term debt	0	0
Payment of debt issuance costs	0	0
Payment of contingent consideration		0
Payment of deferred acquisition consideration	0	0
Net proceeds from issuance of common stock pursuant to employee stock plans	0	0
Excess tax benefit related to equity awards	0	0
Payment of minimum tax withholdings on net share settlements of equity awards	0	0
Intercompany dividend		0
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash and cash equivalents	(0.8)	0.4
Net (decrease) increase in cash and cash equivalents	31.0	31.4
Cash and cash equivalents, beginning of period	113.5	81.0
Cash and cash equivalents, end of period	$ 144.5	$ 112.4