Acquisitions PWSC Assets Assumed and Liabilities Acquired (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Oct. 12, 2017
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			$ 2,071
Liabilities	$ 348,182	$ 450,778	3,168
Assets	378,240	506,685	13,168
Payments to Acquire Businesses, Gross	8,400	10,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets			50
Accrued Fees and Other Revenue Receivable			1,422
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets			118
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment			238
Goodwill	74,659	80,843	2,867
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			5,569
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets			627
Other assets	4,459	4,302	206
Deferred Revenue and Credits			800
Accrued expenses and other liabilities	$ 14,786	$ 10,359	$ 2,368