Net Revenues by Geographic Area (Detail) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenues	$ 688,105	$ 592,972	$ 218,706
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenues	349,456	322,542	115,734
Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenues	244,524	203,172	68,393
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenues	$ 94,125	$ 67,258	$ 34,579