Note 8 - Goodwill and Other Intangibles (Detail) - Ending balance of intangible assets (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Net	$ 193.4	$ 170.4
Patents [Member] | Cost [Member]
Cost		382.8
Patents [Member] | Accumualted Amoritization [Member]
Accumulated Amortization		270.5
Patents [Member] | Cost [Member]
Cost	379.6
Patents [Member] | Accumualted Amoritization [Member]
Accumulated Amortization	310.7
Patents [Member]
Net	68.9	112.3
Developed Technology [Member] | Cost [Member]
Cost		86.9
Developed Technology [Member] | Accumualted Amoritization [Member]
Accumulated Amortization		54.0
Developed Technology [Member] | Cost [Member]
Cost	131.9
Developed Technology [Member] | Accumualted Amoritization [Member]
Accumulated Amortization	68.3
Developed Technology [Member]
Net	63.6	32.9
Contracts [Member] | Cost [Member]
Cost		25.5
Contracts [Member] | Accumualted Amoritization [Member]
Accumulated Amortization		19.5
Contracts [Member] | Cost [Member]
Cost	23.9
Contracts [Member] | Accumualted Amoritization [Member]
Accumulated Amortization	21.1
Contracts [Member]
Net	2.8	6.0
Reacquired Rights [Member] | Cost [Member]
Cost		13.4
Reacquired Rights [Member] | Accumualted Amoritization [Member]
Accumulated Amortization		2.1
Reacquired Rights [Member] | Cost [Member]
Cost	14.7
Reacquired Rights [Member] | Accumualted Amoritization [Member]
Accumulated Amortization	3.5
Reacquired Rights [Member]
Net	11.2	11.3
Customer Relationship [Member] | Cost [Member]
Cost		14.2
Customer Relationship [Member] | Accumualted Amoritization [Member]
Accumulated Amortization		6.9
Customer Relationship [Member] | Cost [Member]
Cost	61.1
Customer Relationship [Member] | Accumualted Amoritization [Member]
Accumulated Amortization	23.9
Customer Relationship [Member]
Net	37.2	7.3
Trademark [Member] | Cost [Member]
Cost		2.1
Trademark [Member] | Accumualted Amoritization [Member]
Accumulated Amortization		1.5
Trademark [Member] | Cost [Member]
Cost	12.5
Trademark [Member] | Accumualted Amoritization [Member]
Accumulated Amortization	2.8
Trademark [Member]
Net	9.7	0.6
Cost [Member]
Cost		524.9
Accumualted Amoritization [Member]
Accumulated Amortization		354.5
Cost [Member]
Cost	623.7
Accumualted Amoritization [Member]
Accumulated Amortization	$ 430.3