Equity (Employee Stock Purchase Plan) (Details)	3 Months Ended
	Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance under the ESPP (in shares) | shares	740,558
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP offering period (months)	6 months
Purchase price (as percentage of market price)	85.00%
Annual contribution (as percentage of compensation)	10.00%
Annual contribution | $	$ 25,000