Restructuring Charges - Activity Related to Restructuring Accruals (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Restructuring Reserve [Roll Forward]
Beginning Balance		$ 7,389		$ 2,073		$ 2,073	$ 2,073
Expenses		996				9,807
Payments		(2,596)				(6,091)
Ending Balance		5,789		7,389		5,789
Facilities and other contract termination costs
Restructuring Reserve [Roll Forward]
Beginning Balance		96		433		433	433
Expenses						25
Payments		(96)				(458)
Ending Balance		0		96		0
Workforce-related termination benefits
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 2,044	7,293	$ 5,939	1,640	$ 5,939	1,640	1,640
Expenses	828	996			2,663	9,782
Payments	(1,182)	(2,500)			(6,912)	(5,633)
Ending Balance	$ 1,690	$ 5,789	$ 2,044	$ 7,293	$ 1,690	$ 5,789	$ 5,939