Intangible Assets - Components of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,436,246	$ 1,346,048
Accumulated Amortization	635,724	597,179
Unamortized intangible assets, Total	63,818	63,815
Acquired in-process research and development [Member]
Finite-Lived Intangible Assets [Line Items]
Unamortized intangible assets, Total	61,136	61,138
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Unamortized intangible assets, Total	2,682	2,677
Core and developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	930,453	856,585
Accumulated Amortization	370,323	344,911
Product rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	163,654	163,465
Accumulated Amortization	17,727	12,232
Patents, trademarks, and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	342,139	325,998
Accumulated Amortization	$ 247,674	$ 240,036