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

12 Months Ended

Jul. 31, 2017

Description of Business and Summary of Significant 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)	2017		2016		2015
Basic weighted-average number of shares		23,182		22,765		22,903
Effect of dilutive securities:
Stock options		44		6		23
Non-vested restricted Class B common stock		83		44		321
Diluted weighted-average number of shares		23,309		22,815		23,247

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

Year ended July 31 (in thousands)	2017		2016		2015
Shares excluded from the calculation of diluted earnings per share		22		209		136

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
2017
Reserves deducted from accounts receivable:
Allowance for doubtful accounts (2)	$	4,818	$	686	$	(297	)	$	5,207
2016
Reserves deducted from accounts receivable:
Allowance for doubtful accounts	$	5,645	$	1,519	$	(2,346	)	$	4,818
2015
Reserves deducted from accounts receivable:
Allowance for doubtful accounts	$	11,507	$	97	$	(5,959	)	$	5,645

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

(2) Includes allowance for doubtful accounts of $2,550 and $861 held for sale at July 31, 2017 and 2016, respectively (see Note 3)