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Shareholders' Equity
 9 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Shareholders' Equity Shareholders' EquityThe following tables present a reconciliation of changes in stockholders' equity for the three and nine months ended June 30, 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 1 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 
Net income— — — — 102,411 102,411 
Other comprehensive loss— — — (79,232)— (79,232)
Cash dividends ($0.625 per share)
— — — — (81,912)(81,912)
Common stock issued:
Public and other stock offerings39,078 1 3,829 — — 3,830 
Stock-based compensation plans80,852 — 7,736 — — 7,736 
Balance, June 30, 2021130,787,039 $654 $4,865,268 $61,239 $2,846,597 $7,773,758 
 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 1 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 1 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 
Net income— — — — 117,791 117,791 
Other comprehensive loss— — — (4,086)— (4,086)
Cash dividends ($0.575 per share)
— — — — (70,597)(70,597)
Common stock issued:
Public and other stock offerings965,576 5 105,799 — — 105,804 
Stock-based compensation plans76,966 — 8,144 — — 8,144 
Balance, June 30, 2020123,351,267 $617 $4,100,130 $(116,727)$2,477,451 $6,461,471 
Shelf Registration, At-the-Market Equity Sales Program and Equity Issuances
On June 29, 2021, we filed a shelf registration statement with the Securities and Exchange Commission (SEC) that allows us to issue up to $5.0 billion in common stock and/or debt securities, which expires June 29, 2024. This shelf registration statement replaced our previous shelf registration statement which was filed on February 11, 2020. At June 30, 2021, $4.0 billion of securities were available for issuance under the shelf registration statement.
On June 29, 2021, we filed a prospectus supplement under the shelf registration statement relating to an at-the-market (ATM) equity sales program (June 2021 ATM) under which we may issue and sell shares of our common stock up to an aggregate offering price of $1.0 billion (including shares of common stock that may be sold pursuant to forward sale agreements entered into concurrently with the ATM equity sales program). This ATM equity sales program replaced our previous ATM equity sales program, filed on February 12, 2020 (February 2020 ATM).
During the nine months ended June 30, 2021, we executed forward sales under our February 2020 ATM equity sales program with various forward sellers who borrowed and sold 3,451,356 shares of our common stock at an aggregate price of $338.3 million. During the nine months ended June 30, 2021, we also settled forward sale agreements with respect to 4,537,669 shares that had been borrowed and sold by various forward sellers under the February 2020 ATM program for net proceeds of $460.7 million. As of June 30, 2021, $1.0 billion of equity was available for issuance under the June 2021 ATM program. Additionally, we had $213.1 million in available proceeds, based on a net price of $94.71 per share, from outstanding forward sale agreements, available through June 30, 2022.
Accumulated Other Comprehensive Income (Loss)
We record deferred gains (losses) in AOCI related to available-for-sale debt securities and interest rate agreement cash flow hedges. Deferred gains (losses) for our available-for-sale debt securities are recognized in earnings upon settlement, while deferred gains (losses) related to our interest rate agreement cash flow hedges are recognized in earnings as they are amortized.
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(165)115,568 115,403 
Amounts reclassified from accumulated other comprehensive income— 3,425 3,425 
Net current-period other comprehensive income (loss)(165)118,993 118,828 
June 30, 2021$73 $61,166 $61,239 
 
Available-
for-Sale
Securities		Interest Rate
Agreement
Cash Flow
Hedges		Total
 (In thousands)
September 30, 2019$132 $(114,715)$(114,583)
Other comprehensive income (loss) before reclassifications202 (4,932)(4,730)
Amounts reclassified from accumulated other comprehensive income(2)2,588 2,586 
Net current-period other comprehensive income (loss)200 (2,344)(2,144)
June 30, 2020$332 $(117,059)$(116,727)