Long Term Debt (Details) (USD $)	0 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended		12 Months Ended
	Oct. 24, 2011	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	May 31, 2011 MKS Acquisition [Member]	Sep. 30, 2011 MKS Acquisition [Member]	May 31, 2011 MKS Acquisition [Member] Minimum [Member]	May 31, 2011 MKS Acquisition [Member] Maximum [Member]	Sep. 30, 2011 Leverage Ratio [Member] Minimum [Member]	Sep. 30, 2011 Leverage Ratio [Member] Maximum [Member]	Sep. 30, 2011 Fixed Charge Coverage Ratio [Member] Minimum [Member]	Sep. 30, 2011 Fixed Charge Coverage Ratio [Member] Maximum [Member]	Sep. 30, 2011 Minimum [Member]	Sep. 30, 2011 Maximum [Member]
Debt Instrument [Line Items]
Date of maturity		Sep. 30, 2016
Credit facility amount		$ 300,000,000
Revolving credit facility, additional borrowings	40,000,000				250,000,000
Variable interest rate of credit facility							30	180
Revolving credit facility additional borrowing limit		150,000,000
Voting interest in foreign subsidiaries pledged against credit facility		65.00%
Borrowings outstanding			0			200,000,000
Credit facility interest rate						1.6875%							1.25%	1.625%
Federal funds effective rate		0.005%
Adjusted LIBO rate		LIBO rate plus 1%
Stated interest rate on base rate borrowings													0.25%	0.625%
Credit facility commitment fees percentage													0.20%	0.30%
Investment limit in foreign subsidiaries		50,000,000
Cash investment limit for acquisition of business		75,000,000
Ratio, terms									1.00	2.50	1.25 to 1.00
Ratio, actual									1.00	0.85	1.00	3.08
Origination cost of credit facility		1,000,000	2,600,000
Payment of interest on revolving credit facility		$ 1,500,000	$ 700,000	$ 2,400,000
Credit facility interest rate		2.10%	1.60%	3.20%