Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Oct. 01, 2019
Revenue Recognition [Abstract]
Contract with Customer, Asset, Net, Current	$ 53,500	$ 53,500
Deferred Costs, Current	16,200	16,200
Contract with Customer, Liability	373,344	373,344	$ 348,006
Capitalized Contract Cost, Net	19,000	19,000
Hardware revenue	8,500	14,800
Capitalized Contract Cost, Net, Noncurrent	38,200	38,200
Capitalized Contract Cost, Amortization	4,500	8,600
Deferred Costs, Noncurrent	34,900	34,900
Contract with Customer, Asset, Net, Noncurrent	$ 123,900	$ 123,900