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Shareholders' Equity (Table)
6 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Reconciliation of Changes in Stockholders Equity The following tables present a reconciliation of changes in stockholders' equity for the three and six months ended March 31, 2021 and 2020.
 Common stockAdditional
Paid-in
Capital
Accumulated
Other
Comprehensive Income
(Loss)
Retained
Earnings
Total
Number of
Shares
Stated
Value
 (In thousands, except share and per share data)
Balance, September 30, 2020
125,882,477 $629 $4,377,149 $(57,589)$2,471,014 $6,791,203 
Net income— — — — 217,678 217,678 
Other comprehensive income— — — 60,121 — 60,121 
Cash dividends ($0.625 per share)
— — — — (79,023)(79,023)
Common stock issued:
Public and other stock offerings2,126,118 11 219,998 — — 220,009 
Stock-based compensation plans144,366 3,167 — — 3,168 
Balance, December 31, 2020128,152,961 641 4,600,314 2,532 2,609,669 7,213,156 
Net income— — — — 296,754 296,754 
Other comprehensive income— — — 137,939 — 137,939 
Cash dividends ($0.625 per share)
— — — — (80,325)(80,325)
Common stock issued:
Public and other stock offerings2,498,026 12 248,948 — — 248,960 
Stock-based compensation plans16,122 — 4,441 — — 4,441 
Balance, March 31, 2021130,667,109 $653 $4,853,703 $140,471 $2,826,098 $7,820,925 
 Common stockAdditional
Paid-in
Capital
Accumulated
Other
Comprehensive Income
(Loss)
Retained
Earnings
Total
Number of
Shares
Stated
Value
 (In thousands, except share and per share data)
Balance, September 30, 2019
119,338,925 $597 $3,712,194 $(114,583)$2,152,015 $5,750,223 
Net income— — — — 178,673 178,673 
Other comprehensive income— — — 1,052 — 1,052 
Cash dividends ($0.575 per share)
— — — — (69,557)(69,557)
Common stock issued:
Public and other stock offerings2,758,929 13 263,259 — — 263,272 
Stock-based compensation plans164,549 4,111 — — 4,112 
Balance, December 31, 2019122,262,403 611 3,979,564 (113,531)2,261,131 6,127,775 
Net income— — — — 239,646 239,646 
Other comprehensive income— — — 890 — 890 
Cash dividends ($0.575 per share)
— — — — (70,520)(70,520)
Common stock issued:
Public and other stock offerings38,662 3,095 — — 3,096 
Stock-based compensation plans7,660 — 3,528 — — 3,528 
Balance, March 31, 2020122,308,725 $612 $3,986,187 $(112,641)$2,430,257 $6,304,415 
Schedule of Accumulated Other Comprehensive Income (Loss) The following tables provide the components of our accumulated other comprehensive income (loss) balances, net of the related tax effects allocated to each component of other comprehensive income (loss).
Available-
for-Sale
Securities
Interest Rate
Agreement
Cash Flow
Hedges
Total
 (In thousands)
September 30, 2020$238 $(57,827)$(57,589)
Other comprehensive income (loss) before reclassifications(129)195,906 195,777 
Amounts reclassified from accumulated other comprehensive income— 2,283 2,283 
Net current-period other comprehensive income (loss)(129)198,189 198,060 
March 31, 2021$109 $140,362 $140,471 
 
Available-
for-Sale
Securities
Interest Rate
Agreement
Cash Flow
Hedges
Total
 (In thousands)
September 30, 2019$132 $(114,715)$(114,583)
Other comprehensive loss before reclassifications(163)— (163)
Amounts reclassified from accumulated other comprehensive income(1)2,106 2,105 
Net current-period other comprehensive income (loss)(164)2,106 1,942 
March 31, 2020$(32)$(112,609)$(112,641)