Acquisitions - General Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Nov. 28, 2016
Business Acquisition [Line Items]
Amortization of acquired intangible assets	$ 5.5	$ 4.1
4titude Limited
Business Acquisition [Line Items]
Actual revenues	3.4
Actual net income (loss)	(1.1)
Inventory step up	1.2
Amortization of acquired intangible assets	1.0
PBMMI and Novare
Business Acquisition [Line Items]
Actual revenues	2.3
Actual net income (loss)	(0.1)
Amortization of acquired intangible assets	0.4
Cool Lab, LLC
Business Acquisition [Line Items]
Liabilities arising from contingencies, amount recognized	0.8		$ 0.7	$ 0.7
Actual revenues	1.0	0.3
Actual net income (loss)		(0.1)
Amortization of acquired intangible assets	0.4	$ 0.1
Selling, General and Administrative Expenses | 4titude Limited
Business Acquisition [Line Items]
Acquisition related costs	0.5
Maximum | Cool Lab, LLC
Business Acquisition [Line Items]
Actual net income (loss)	$ (0.1)