Business Acquisitions (Details) (USD $)	12 Months Ended						12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Development-Stage Entity For Advanced Technology	Sep. 30, 2012 Development-Stage Entity For Advanced Technology	Sep. 30, 2011 Development-Stage Entity For Advanced Technology	Sep. 30, 2013 Technology Company Developing and Manufacturing Dental Products	Oct. 08, 2012 Technology Company Developing and Manufacturing Dental Products
Business Acquisition, Entity Acquired and Reason for Acquisition [Abstract]
Business Acquisition, Effective Date of Acquisition				May 16, 2011			Oct. 08, 2012
Business Acquisition, Percentage of Voting Interests Acquired				100.00%			100.00%
Business Combination, Additional Disclosures
Fair value of total consideration transferred	$ 46,636,000	$ 0	$ 31,048,000	$ 31,000,000			$ 46,600,000
Cost of aquire entity, cash paid	(36,673,000)	0	(20,895,000)	20,900,000			36,700,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low				0			0
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High				28,000,000			13,000,000
Goodwill	672,086,000	631,077,000				4,900,000
Fair value at acquisition date	5,419,000	0	10,153,000
Business Acquisition, Contingent Consideration, at Fair Value	13,400,000			7,500,000	7,900,000	10,200,000	5,900,000	5,400,000
Changes in fair value of contingent consideration	$ (100,000)			$ (400,000)			$ 300,000