Treasury Stock Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Equity [Abstract]
Number of shares repurchased (in shares)	249,908	0	249,908
Value of shares repurchased	$ 3,628		$ 3,628
Purchase of treasury stock		$ 0	$ 3,393	$ 235
Number of remaining shares authorized to be repurchased (in shares)		0		0