Supplemental Guarantor Condensed Consolidating Financials - Schedule of Supplemental Condensed Consolidating Statements of Comprehensive (Loss) Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 11.3	$ (11.0)	$ (10.8)	$ (58.9)
Changes in foreign currency translation adjustment	3.3	(2.9)	(3.7)	(9.3)
Changes in unrealized holding gains on available-for-sale securities	4.2	0.1	1.9	2.3
Changes in pension plans, net of taxes	0	0	(0.6)	0
Comprehensive income (loss)	18.8	(13.8)	(13.2)	(65.9)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(7.6)	91.3	(4.2)	15.4
Changes in foreign currency translation adjustment	0	0	0	0
Changes in unrealized holding gains on available-for-sale securities	0	0	0	0
Changes in pension plans, net of taxes			0
Comprehensive income (loss)	(7.6)	91.3	(4.2)	15.4
Parent/Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	11.3	(11.0)	(10.8)	(58.9)
Changes in foreign currency translation adjustment	0	0	0	0
Changes in unrealized holding gains on available-for-sale securities	0	0	0	0
Changes in pension plans, net of taxes			0
Comprehensive income (loss)	11.3	(11.0)	(10.8)	(58.9)
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	16.0	(88.2)	55.4	(21.3)
Changes in foreign currency translation adjustment	0.3	0	0.4	0.2
Changes in unrealized holding gains on available-for-sale securities	4.2	0.1	1.9	2.3
Changes in pension plans, net of taxes			0
Comprehensive income (loss)	20.5	(88.1)	57.7	(18.8)
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(8.4)	(3.1)	(51.2)	5.9
Changes in foreign currency translation adjustment	3.0	(2.9)	(4.1)	(9.5)
Changes in unrealized holding gains on available-for-sale securities	0	0	0	0
Changes in pension plans, net of taxes			(0.6)
Comprehensive income (loss)	$ (5.4)	$ (6.0)	$ (55.9)	$ (3.6)