Leasing Arrangements - Schedule of Condensed Income Statement Of Operation (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Condensed Income Statements, Captions [Line Items]
Right-of-use assets, net obtained in exchange for operating lease liabilities	$ 381	$ 1,394	$ 1,073	$ 1,616
Lease costs within cost of sales
Condensed Income Statements, Captions [Line Items]
Operating lease cost	213	165	569	424
Lease costs within operating expenses
Condensed Income Statements, Captions [Line Items]
Operating lease cost	$ 390	$ 330	$ 1,151	$ 889