XML 16 R5.htm IDEA: XBRL DOCUMENT v3.20.2

Consolidated Statements of Income (Parenthetical)	Sep. 30, 2020	Sep. 25, 2020	Sep. 30, 2019
Income Statement [Abstract]
Stock dividend, percent	300.00%	3.00%	300.00%

X

- Definition

Stock Dividend, Percent

+ References

No definition available.

+ Details

Name:	arow_StockDividendPercent
Namespace Prefix:	arow_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration