Condensed Consolidated Statement of Stockholders’ Equity Statement (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]
Balances at beginning of period at Sep. 30, 2011	$ 297.6	$ 0.2	$ (0.1)	$ 205.2	$ 97.0	$ (6.0)	$ 1.3
Components of comprehensive income
Net income	6.6				6.7		(0.1)
Change in foreign currency translation, net of tax	(0.6)					(0.6)
Change in pension liabilities, net of tax	0.2					0.2
Change in unrealized gain or loss on available-for-sale securities, net of tax	6.2					6.2
Total comprehensive income	12.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options	1.7			1.7
Stock-based Compensation	3.8			3.8
Repurchase of stock	(2.8)		(2.8)
Disposition or de-consolidation	(1.2)						(1.2)
Balances at end of period at Jun. 30, 2012	$ 311.5	$ 0.2	$ (2.9)	$ 210.7	$ 103.7	$ (0.2)	$ 0