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Stockholders' Equity and Noncontrolling Interests - Schedule of Accumulated Other Comprehensive Loss and Related Tax Effects (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period $ 1,744.2 $ 1,726.3 $ 1,616.4
Balance at end of period 1,499.3 1,744.2 1,726.3
Net Unrealized Gains (Losses) Defined Benefit Pension and Post-Retirement Benefit Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period (63.3) (46.1) (44.1)
Other comprehensive earnings (loss) before reclassifications 19.8 (23.4) (4.5)
Amounts reclassified out of other comprehensive loss 3.4 2.4 2.1
Tax benefit (expense) (4.0) 3.8 0.4
Balance at end of period (44.1) (63.3) (46.1)
Net Unrealized Gains (Losses) Cash Flow Hedging Instruments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period 0.0 0.0 1.0
Other comprehensive earnings (loss) before reclassifications 0.0 (1.0) 2.2
Amounts reclassified out of other comprehensive loss 0.0 1.0 (3.8)
Tax benefit (expense) 0.0 0.0 0.6
Balance at end of period 0.0 0.0 0.0
Net Unrealized Gains (Losses) Available-for- Sale Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period 0.0 (0.1) 0.0
Other comprehensive earnings (loss) before reclassifications 0.0 (0.4) (0.2)
Amounts reclassified out of other comprehensive loss 0.0 0.6 0.0
Tax benefit (expense) 0.0 (0.1) 0.1
Balance at end of period 0.0 0.0 (0.1)
Cumulative Translation Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period (37.5) (40.3) (15.5)
Other comprehensive earnings (loss) before reclassifications 12.8 2.8 (24.8)
Amounts reclassified out of other comprehensive loss 0.0 0.0 0.0
Tax benefit (expense) 0.0 0.0 0.0
Balance at end of period (24.7) (37.5) (40.3)
Accumulated Other Comprehensive Loss      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period (100.8) (86.5) (58.6)
Other comprehensive earnings (loss) before reclassifications 32.6 (22.0) (27.3)
Amounts reclassified out of other comprehensive loss 3.4 4.0 (1.7)
Tax benefit (expense) (4.0) 3.7 1.1
Balance at end of period $ (68.8) $ (100.8) $ (86.5)