Income per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Per Share [Abstract]
Net income attributable to Sirona Dental Systems, Inc. shareholders	$ 36,235	$ 40,550	$ 31,658	$ 38,302	$ 34,736	$ 30,298	$ 30,521	$ 38,277	$ 146,745	$ 133,832	$ 121,793
Weighted average shares outstanding - basic	54,980,287	55,002,236	54,928,332	55,004,471	55,128,904	55,507,312	55,683,043	55,783,648	54,979,044	55,524,188	55,735,422
Dilutive effect of stock-based compensation									1,234,948	1,231,208	1,557,574
Weighted average shares - diluted	56,090,777	56,220,901	56,202,296	56,327,927	56,388,273	56,717,943	56,916,390	57,121,505	56,213,992	56,755,396	57,292,996
Net income per share
Basic	$ 0.66	$ 0.74	$ 0.58	$ 0.70	$ 0.63	$ 0.55	$ 0.55	$ 0.69	$ 2.67	$ 2.41	$ 2.19
Diluted	$ 0.65	$ 0.72	$ 0.56	$ 0.68	$ 0.62	$ 0.53	$ 0.54	$ 0.67	$ 2.61	$ 2.36	$ 2.13
Stock options excluded from computation of diluted earnings per share									0	0	0