Net Revenues based upon Source of Order by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenues	$ 519,451	$ 688,105	$ 592,972
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenues	230,735	349,456	322,542
Asia/Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenues	194,711	244,524	203,172
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Revenues	$ 94,005	$ 94,125	$ 67,258