Intangible Assets - Components of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,424,179	$ 1,346,048
Accumulated Amortization	615,256	597,179
Unamortized intangible assets, Total	63,959	63,815
Acquired in-process research and development [Member]
Finite-Lived Intangible Assets [Line Items]
Unamortized intangible assets, Total	61,281	61,138
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Unamortized intangible assets, Total	2,678	2,677
Core and developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	924,885	856,585
Accumulated Amortization	356,077	344,911
Product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	161,495	163,465
Accumulated Amortization	14,789	12,232
Patents, trademarks, and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	337,799	325,998
Accumulated Amortization	$ 244,390	$ 240,036