Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended				3 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended				3 Months Ended
	Mar. 31, 2009 Year Segment	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2009 Cost of Sales	Mar. 31, 2009 Cost of Sales Completed technology	Sep. 30, 2009 Cost of Sales Completed technology	Sep. 30, 2009 Cost of Sales Property Plant and Equipment	Sep. 30, 2009 Operating Expense	Mar. 31, 2009 Operating Expense Trade Name	Sep. 30, 2009 Operating Expense Trade Name	Mar. 31, 2009 Operating Expense Customer relationships	Sep. 30, 2009 Operating Expense Customer relationships	Sep. 30, 2010 Patents and other intellectual property Year	Sep. 30, 2011 Completed technology	Sep. 30, 2011 Customer relationships	Jun. 30, 2009 Property Plant and Equipment	Mar. 31, 2009 Property Plant and Equipment	Sep. 30, 2011 Trademarks and trade names
Goodwill and Intangible Assets Disclosure [Line Items]
Number of reporting units	7
Number of reporting units subject to goodwill reallocation	5
Weighted average cost Of capital (WACC) used to test goodwill, percentage				16.20%
Impairment of goodwill	$ 71,800,000			$ 71,800,000
Remaining useful life of intangible asset, minimum	3
Remaining useful life of intangible asset, maximum	8
Discount rate	16.00%
Impairment of long-lived assets	35,100,000			35,512,000	20,924,000	19,608,000	19,608,000	1,316,000	14,588,000	1,145,000	1,145,000	13,443,000	13,443,000				400,000	900,000
Identifiable intangible assets															7,500,000	31,600,000			200,000
Acquired patents and other intellectual property														900,000
Acquired patents and other intellectual property, amortization period														10
Amortization expense for intangible assets		$ 4,600,000	$ 3,900,000	$ 10,200,000