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Summary of Significant Accounting and Reporting Policies (Earnings Per Share) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 31, 2021
Apr. 30, 2021
Jan. 31, 2021
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2020
Jan. 31, 2020
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Accounting Policies [Abstract]                              
Reduction in weighted average shares as a result of the repurchase of common shares (in shares)                         0 0 0
Weighted average performance shares outstanding during the period that are excluded from EPS calculation                         232,000 201,000 243,000
Numerator:                              
Net (loss) income for basic calculation $ 7,363,000 $ 792,000 $ 4,205,000 $ (85,840,000) $ 1,126,000 $ (3,989,000) $ 3,495,000 $ 6,388,000 $ 6,135,000 $ 7,612,000 $ 7,826,000 $ 3,468,000 $ (73,480,000) $ 7,020,000 $ 25,041,000
Numerator for diluted calculation                         $ (73,480,000) $ 7,020,000 $ 25,041,000
Denominator:                              
Denominator for basic calculation (in shares)                         25,685,000 24,798,000 24,124,000
Effect of dilutive securities:                              
Stock-based awards (in shares)                         0 101,000 178,000
Denominator for diluted calculation (in shares)                         25,685,000 24,899,000 24,302,000
Stock-based Awards                              
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                              
Antidilutive equity-classified stock-based awards not included in calculation of diluted earnings per share (in shares)                         1,440,000 1,348,000 1,347,000