Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 25, 2018	Jun. 11, 2018	Oct. 06, 2017	Sep. 30, 2017	Jun. 30, 2017
Business Acquisition [Line Items]
Goodwill	$ 292,544				$ 254,760	$ 254,469
GPMX
Business Acquisition [Line Items]
Cash and cash equivalents				$ 2,560
Earning assets				17,247
Other assets				3,450
Property and equipment, intangible assets and other assets, net				11,671
Goodwill				34,022
Accounts payable, deferred taxes and other liabilities				(7,234)
Total consideration				61,716
GPMX | Trade Names
Business Acquisition [Line Items]
Indefinite lived intangible assets				$ 9,800
All Other
Business Acquisition [Line Items]
Cash and cash equivalents			$ 0
Earning assets			7,980
Other assets			4,272
Property and equipment, intangible assets and other assets, net			18,868
Goodwill			4,192
Accounts payable, deferred taxes and other liabilities			(159)
Total consideration			$ 35,153
All Other | Trade Names
Business Acquisition [Line Items]
Indefinite lived intangible assets		$ 14,000