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SELECTED QUARTERLY OPERATING RESULTS (Tables)
 12 Months Ended
Sep. 30, 2020
Selected Quarterly Financial Information [Abstract]  
Selected quarterly operating results
The following table presents our unaudited financial information for the eight quarterly periods ended September 30, 2020.  This unaudited financial information has been prepared in accordance with accounting principles generally accepted in the United States of America, applied on a basis consistent with the annual audited financial statements and in the opinion of management, include all necessary adjustments, which consist only of normal recurring adjustments necessary to present fairly the financial results for the periods.  The results for any quarter are not necessarily indicative of results for any future period.

SELECTED QUARTERLY OPERATING RESULTS
(Unaudited and in thousands, except per share amounts)
September 30, 2020June 30,
2020		March 31,
2020		Dec. 31,
2019		September 30, 2019June 30,
2019		March 31,
2019		Dec. 31,
2018
Revenue$274,207 $274,727 $284,193 $283,143 $278,645 $271,882 $265,391 $221,778 
Cost of sales157,144 152,973 163,091 154,461 165,535 156,492 150,571 122,445 
Gross profit117,063 121,754 121,102 128,682 113,110 115,390 114,820 99,333 
Operating income (loss)46,068 57,742 51,663 61,432 (17,623)52,240 51,714 24,165 
Net income (loss)$36,855 $34,525 $32,899 $38,549 $(20,243)$18,878 $27,137 $13,443 
Basic earnings (loss) per share1
$1.27 $1.19 $1.12 $1.32 $(0.70)$0.65 $0.94 $0.50 
Diluted earnings (loss) per share1
$1.25 $1.17 $1.11 $1.30 $(0.70)$0.64 $0.92 $0.48 
1 The total of the individual quarters may not equal full year results as quarterly per share information is calculated using the quarterly weighted average shares.