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Net Income per Common Share - Reconciliation of Numerator and Denominator of Basic and Diluted Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015
Earnings Per Share [Line Items] |  |  |  |
Earnings from continuing operations | $ 15,290 | $ 11,584 | $ 33,993 | $ 27,083
Denominator for basic earnings (loss) from continuing operations per share for both Class A and Class B | 50,527 | 51,272 | 50,778 | 51,262
Plus: Effect of dilutive stock options | 120 | 76 | 90 | 68
Denominator for diluted net income per share for both Class A and Class B | 50,647 | 51,348 | 50,868 | 51,330
Class A nonvoting common stock |  |  |  |
Earnings Per Share [Line Items] |  |  |  |
Earnings from continuing operations per basic share | $ 0.30 | $ 0.23 | $ 0.67 | $ 0.53
Earnings from continuing operations per diluted share | 0.30 | 0.23 | 0.67 | 0.53
Earnings (loss) from discontinued operations per basic share | 0.00 | 0.00 | 0.00 | (0.04)
Earnings (loss) from discontinued operations per diluted share | 0.00 | 0.00 | 0.00 | (0.04)
Net earnings per share, basic | 0.30 | 0.23 | 0.67 | 0.49
Net earnings per share, diluted | $ 0.30 | $ 0.23 | $ 0.67 | $ 0.49
Class B voting common stock |  |  |  |
Earnings Per Share [Line Items] |  |  |  |
Earnings from continuing operations | $ 15,290 | $ 11,584 | $ 33,209 | $ 26,288
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities | 0 | 0 | 1 | 1
Payments of Ordinary Dividends | $ 0 | $ 0 | $ 783 | $ 794
Earnings from continuing operations per basic share | $ 0.30 | $ 0.23 | $ 0.65 | $ 0.51
Earnings from continuing operations per diluted share | 0.30 | 0.23 | 0.65 | 0.51
Earnings (loss) from discontinued operations per basic share | 0.00 | 0.00 | 0.00 | (0.03)
Earnings (loss) from discontinued operations per diluted share | 0.00 | 0.00 | 0.00 | (0.04)
Net earnings per share, basic | 0.30 | 0.23 | 0.65 | 0.48
Net earnings per share, diluted | $ 0.30 | $ 0.23 | $ 0.65 | $ 0.47

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units. + References No definition available. + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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