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Stock-Based Compensation
 6 Months Ended
Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation
11.
STOCK-BASED COMPENSATION:

We account for our stock-based compensation plans following the provisions of FASB ASC 718, “Compensation — Stock Compensation” (“ASC 718”). In accordance with ASC 718, we use the Black-Scholes valuation model for valuing all options granted (Note 13) and shares purchased under our Amended 2008 Employee Stock Purchase Plan (“Stock Purchase Plan”). We measure compensation for restricted stock awards and restricted stock units (Note 14) at fair value on the grant date based on the number of shares expected to vest and the quoted market price of our common stock. We recognize compensation cost for all awards in operations on a straight-line basis over the requisite service period for each separately vesting portion of the award.

During the three months ended March 31, 2022 and 2023, we recognized stock-based compensation expense of approximately $3.9 million and $5.4 million, respectively, and for the six months ended March 31, 2022 and 2023, we recognized stock-based compensation expense of approximately $7.2 million and $10.2 million, respectively, in selling, general, and administrative expenses in the accompanying Unaudited Condensed Consolidated Statements of Operations.

No cash was received from option exercises or the Stock Purchase Plan under all share-based compensation arrangements for the three months ended March 31, 2022 and March 31, 2023. Cash received from option exercises or the Stock Purchase Plan under all share-based compensation arrangements for the six months ended March 31, 2022 and 2023, was approximately $1.1 million and $1.3 million, respectively. We currently expect to satisfy share-based awards with registered shares available to be issued from the Stock Purchase Plan.