Acquisition (Narrative) (Details) (USD $)	3 Months Ended		0 Months Ended	3 Months Ended		0 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Sep. 02, 2011 4C Solutions Inc [Member]	Dec. 31, 2011 4C Solutions Inc [Member]	Sep. 30, 2011 4C Solutions Inc [Member]	May 31, 2011 MKS Inc [Member]
Revenue of acquirees since acquisition dates, actual	$ 18,500,000
Operating costs and expenses of acquirees since acquisition dates, actual	26,600,000
Acquisition-related cost	2,100,000
Amortization of intangibles acquired in business acquisition	3,400,000
Cash paid to acquire business, net of cash acquired	880,000	0	14,900,000
Cash acquired from acquisition			100,000			33,200,000
Contingent purchase price included in accrued expenses and other current liabilities					1,200,000
Contingent purchase liability, cash paid				900,000
Purchase price of acquired entity						$ 265,200,000