Stock Repurchase and Dividends - Schedule of Dividends Declared and Paid (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended	6 Months Ended
Feb. 28, 2019	Dec. 14, 2018	Mar. 02, 2018	Dec. 15, 2017	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2019	Apr. 01, 2018
Stock Repurchase And Dividends [Abstract]
Dividend Paid Per Share (in dollars per share)	$ 0.12	$ 0.12	$ 0.1	$ 0.1	$ 0.12	$ 0.10	$ 240.00	$ 0.20
Dividend Paid	$ 6,616	$ 6,654	$ 5,583	$ 5,589			$ 13,270	$ 11,172

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration