Description of Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jul. 31, 2019

Accounting Policies [Abstract]

Schedule of weighted-average number of shares used in the calculation of basic and diluted earnings per share

Year ended July 31 (in thousands)	2019		2018		2017
Basic weighted-average number of shares		25,293		24,655		23,182
Effect of dilutive securities:
Stock options		—		9		44
Non-vested restricted Class B common stock		15		54		83
Diluted weighted-average number of shares		25,308		24,718		23,309

Schedule of outstanding stock options excluded from the calculation of diluted earnings per share

Year ended July 31 (in thousands)	2019		2018		2017
Shares excluded from the calculation of diluted earnings per share		1,204		1,142		22

Schedule of change in the allowance for doubtful accounts

Year ended July 31 (in thousands)	Balance at beginning of year		Additions charged to costs and expenses		Deductions (1)			Balance at end of year
2019
Reserves deducted from accounts receivable:
Allowance for doubtful accounts	$	5,358	$	2,028	$	(1,942	)	$	5,444
2018
Reserves deducted from accounts receivable:
Allowance for doubtful accounts	$	5,207	$	2,199	$	(2,048	)	$	5,358
2017
Reserves deducted from accounts receivable:
Allowance for doubtful accounts	$	4,818	$	686	$	(297	)	$	5,207

(1) Primarily uncollectible accounts written off, net of recoveries.