Long Term Debt (Details) (USD $)	3 Months Ended	6 Months Ended		3 Months Ended		1 Months Ended	2 Months Ended
	Mar. 31, 2012 banks	Mar. 31, 2012 banks	Apr. 02, 2011	Mar. 31, 2012 Maximum [Member]	Mar. 31, 2012 Minimum [Member]	May 31, 2011 MKS Inc [Member]	Nov. 22, 2011 MKS Inc [Member]	Mar. 31, 2012 MKS Inc [Member]	Sep. 30, 2011 MKS Inc [Member]
Debt Instrument [Line Items]
Revolving credit facility syndicate, number of participating banks	10	10
Credit facility amount	$ 300,000,000	$ 300,000,000
Revolving credit facility additional borrowing limit	150,000,000
Voting interest in foreign subsidiaries pledged against credit facility	65.00%
Revolving credit facility, additional borrowings	40,000,000					250,000,000
Borrowings outstanding								160,000,000	200,000,000
Repayment of line of credit	40,000,000	80,000,000	0
Credit facility interest rate				1.625%	1.25%		1.6875%
Credit facility, interest rate at period end	1.875%	1.875%
Basis spread over base rate				0.625%	0.25%
Basis spread on federal funds effective rate	0.005%
Basis spread on adjusted LIBOR	1.00%
Credit facility commitment fees percentage				0.30%	0.20%
Investment limit in foreign subsidiaries	50,000,000	50,000,000
Cash investment limit for acquisition of business	$ 75,000,000	$ 75,000,000
Maximum leverage ratio allowed under debt covenant	2.5	2.5
Minimum fixed charge coverage ratio allowed under debt covenant	1.25	1.25
Leverage ratio, actual	0.65	0.65
Fixed charge coverage ratio, actual	2.82	2.82