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Common Stock and Related Matters - Schedule of Changes in Common Stock (Details) - USD ($) $ in Millions | 12 Months Ended
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Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Common Stock [Roll Forward] |  |  |
Balance beginning of period (in shares) | 53,885,165 |  |
Balance, beginning of period | $ 0.5 |  |
Issuance of restricted stock grants, net of cancellations | 28.8 | $ 32.7 | $ 23.1
Stock options exercised | $ 2.2 | $ 0.1 |
Balance end of period (in shares) | 54,018,978 | 53,885,165 |
Balance end of period | $ 0.5 | $ 0.5 |
Common Stock |  |  |
Common Stock [Roll Forward] |  |  |
Balance beginning of period (in shares) | 53,900,000 | 53,800,000 | 53,700,000
Balance, beginning of period | $ 0.5 | $ 0.5 | $ 0.5
Issuance of restricted stock grants, net of cancellations (in shares) | 100,000 | 100,000 | 100,000
Issuance of restricted stock grants, net of cancellations | $ 0.0 | $ 0.0 | $ 0.0
Stock options exercised (in shares) | 0 | 0 |
Stock options exercised | $ 0.0 | $ 0.0 |
Balance end of period (in shares) | 54,000,000.0 | 53,900,000 | 53,800,000
Balance end of period | $ 0.5 | $ 0.5 | $ 0.5

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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