Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]    
Interest rate hedge, tax $ 0 $ 0