Summary of Significant Accounting Policies - Other (Details) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Jul. 24, 2008
Investments
Investments	$ 8,300,000	$ 12,100,000
Maximum amount of additional funding commitments on certain investments	$ 1,000,000
Treasury Stock
Maximum amount of common stock repurchases				$ 100,000,000.0
Treasury Stock, Shares, Acquired	2,100,000
Shares repurchased and classified as treasury stock	$ 50,300,000
Shares Repurchased	381,000
Shares repurchased (in dollars)	$ 11,200,000	$ 16,500,000
Shares issued from treasury stock under various stock compensation programs (in shares)	300,000	100,000
Remaining amount of share repurchases	$ 49,700,000
Preferred stock
Authorized shares of preferred stock (in shares)	1,000,000
Preferred stock par value (in dollars per share)	$ 0	$ 0
Shares issued	0	0
Accumulated other comprehensive loss
Currency translation	$ (52,100,000)	$ (4,900,000)
Pension and postretirement (net of taxes of $29.3 and $26.4)	(54,400,000)	(46,000,000)
Unrealized (loss) gain on derivative instruments (net of taxes of $0.8 and $0.6)	(1,400,000)	(1,300,000)
Accumulated other comprehensive loss	(107,900,000)	(52,200,000)
Pension and postretirement, taxes	29,300,000	26,400,000
Unrealized gain (loss) on derivative instruments, taxes	$ 800,000	$ 600,000
Revenue recognition
Revenue from long-term manufacturing contracts as a percentage of total revenue	29.00%	25.00%	25.00%
Research and Development Costs
Research and development costs	$ 12,700,000	$ 14,400,000	$ 12,200,000
Warranty costs
Warranty reserves	18,200,000	18,400,000
Warranty costs	4,000,000	4,500,000	$ 4,000,000
Derivative instruments and hedging activity
Foreign currency exchange forward contracts, assets at fair value	1,100,000	1,200,000
Foreign currency exchange forward contracts, liabilities at fair value	5,800,000	4,100,000
Cash Flow Hedging | Foreign Exchange Forward
Derivative instruments and hedging activity
Aggregate notional value of derivatives	$ 136,700,000	$ 123,300,000
Minimum
Investments
Period for additional funding	3 years
Warranty costs
Period over which Process equipment group offers warranty	1 year
Derivative instruments and hedging activity
Term of foreign currency exchange forward contracts	1 month
Maximum
Investments
Period for additional funding	5 years
Self-Insurance
Deductibles and self-insured retentions per occurrence	$ 500,000
Warranty costs
Period over which Process equipment group offers warranty	2 years
Derivative instruments and hedging activity
Term of foreign currency exchange forward contracts	24 months
Business acquisitions and related business acquisition and transition costs
Measurement period over which initial purchase price allocations are subject to revision	1 year