Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	4 Months Ended	6 Months Ended
	Mar. 31, 2019	Jul. 05, 2018	Mar. 31, 2019	Dec. 31, 2018	Sep. 21, 2018	Sep. 25, 2017
Stockholders' Equity Attributable to Parent [Abstract]
Stock Repurchase Program, Authorized Amount					$ 100,000	$ 25,000
Stock Repurchased During Period, Shares	13,100,000	8,700,000	21,800,000
Stock Repurchased During Period, Value	$ 44,400	$ 25,000	$ 69,900
Treasury Stock Acquired, Average Cost Per Share	$ 3.38	$ 2.86	$ 3.21
Treasury Stock, Shares, Acquired	400,000		400,000
Treasury Stock, Value	$ 1,490		$ 1,490	$ 2,103