Consolidated Statements of Stockholders’ Equity (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, 2009	$ 240.5	$ 0.2	$ (0.1)	$ 187.0	$ 54.3	$ (2.6)	$ 1.7
Components of comprehensive income
Net income	5.1				5.4		(0.3)
Change in foreign currency translation, net of tax	(0.1)					(0.1)
Change in unrealized loss on derivative instruments, net of tax						1.1
Change in pension liabilities, net of tax	(1.7)
Change in unrealized gain or loss on available-for-sale securities, net of tax	0.2
Total comprehensive income	4.6
Exercise of stock options	0.7			0.7
Stock-based Compensation	1.9			1.9
Acquisition or consolidation	1.6
Disposition or de-consolidation	(1.4)						(1.4)
Stock held in escrow for business combination	(5.0)
Balances at end of period at Sep. 30, 2010	242.9	0.2	(0.1)	184.6	59.7	(3.1)	1.6
Components of comprehensive income
Net income	37.2				37.3		(0.1)
Change in foreign currency translation, net of tax	(0.4)					(0.4)
Change in unrealized loss on derivative instruments, net of tax						1.0
Change in pension liabilities, net of tax	(2.9)
Change in unrealized gain or loss on available-for-sale securities, net of tax	(0.6)
Total comprehensive income	34.3
Redemption of fund units	(0.2)
Exercise of stock options	1.4			1.4
Stock-based Compensation	2.3			2.3
Convertible note conversions	16.9
Balances at end 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	14.9				15.0		(0.1)
Change in foreign currency translation, net of tax	(1.1)					(1.1)
Change in pension liabilities, net of tax	(1.6)
Change in unrealized gain or loss on available-for-sale securities, net of tax	6.5
Total comprehensive income	18.7
Exercise of stock options	1.9
Stock-based Compensation	5.9			5.9
Exercise of stock options	2.1			2.1
Disposition or de-consolidation	(1.2)						(1.2)
Repurchase of stock	(4.0)		(4.0)
Balances at end of period at Sep. 30, 2012	$ 319.1	$ 0.2	$ (4.1)	$ 213.2	$ 112.0	$ (2.2)	$ 0