Income Taxes (Narrative) (Details)	Sep. 30, 2016 USD ($) Jurisdiction	Sep. 30, 2015 USD ($)
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards and tax credits without expiration	$ 6,400,000
Foreign subsidiary earnings	700,000,000
Amount in excess of potential U.S. tax	99,000,000
Uncertain tax positions	9,400,000
Accrued interest	1,400,000	$ 700,000
Deferred tax asset related to accrued interest	300,000	200,000
Penalties	$ 1,500,000	$ 1,300,000
Number of foreign jurisdictions | Jurisdiction	50
Between 2018 and 2020
Operating Loss Carryforwards [Line Items]
Tax loss carryforwards	$ 11,400,000