Share Based Compensation (Summary Of Non-Vested RSUs Activity) (Details) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares | shares	0.3
Granted, Weighted Average Grant Date Fair Value | $ / shares	$ 109.88
Granted, Fair Value at Grant Date | $	$ 36.5
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Shares | shares	0.8
Granted, Shares | shares	0.3
Forfeited, Shares | shares	(0.1)
Vested, Shares | shares	(0.5)
Ending balance, Shares | shares	0.5
Beginning balance, Weighted Average Grant Date Fair Value | $ / shares	$ 114.67
Granted, Weighted Average Grant Date Fair Value | $ / shares	109.88
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	116.13
Vested, Weighted Average Grant Date Fair Value | $ / shares	113.21
Ending balance, Weighted Average Grant Date Fair Value | $ / shares	$ 112.74
Beginning balance, Fair Value at Grant Date | $	$ 87.2
Granted, Fair Value at Grant Date | $	36.5
Forfeited, Fair Value at Grant Date | $	(10.0)
Vested, Fair Value at Grant Date | $	(55.1)
Ending balance, Fair Value at Grant Date | $	$ 58.6
SB/RH Holdings, LLC [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Shares | shares	0.3
Granted, Weighted Average Grant Date Fair Value | $ / shares	$ 110.09
Granted, Fair Value at Grant Date | $	$ 35.1
SB/RH Holdings, LLC [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, Shares | shares	0.7
Granted, Shares | shares	0.3
Forfeited, Shares | shares	(0.1)
Vested, Shares | shares	(0.4)
Ending balance, Shares | shares	0.5
Beginning balance, Weighted Average Grant Date Fair Value | $ / shares	$ 116.32
Granted, Weighted Average Grant Date Fair Value | $ / shares	110.09
Forfeited, Weighted Average Grant Date Fair Value | $ / shares	116.13
Vested, Weighted Average Grant Date Fair Value | $ / shares	114.19
Ending balance, Weighted Average Grant Date Fair Value | $ / shares	$ 114.27
Beginning balance, Fair Value at Grant Date | $	$ 82.4
Granted, Fair Value at Grant Date | $	35.1
Forfeited, Fair Value at Grant Date | $	(10.0)
Vested, Fair Value at Grant Date | $	(50.9)
Ending balance, Fair Value at Grant Date | $	$ 56.6