Shareholders' Equity (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Aug. 31, 2016 USD ($)	Aug. 31, 2015 USD ($)	Aug. 31, 2014 USD ($)	Jul. 31, 2016 USD ($) shares	Jul. 31, 2015 USD ($) Installments shares	Jul. 31, 2014 USD ($) Transaction Installments shares	Aug. 31, 2010 shares
Cash Dividends [Abstract]
Cash dividends declared				$ 1,895	$ 2,066	$ 2,066
Dividends paid		$ 1,000	$ 1,000	2,100	2,100	2,100
Schedule of Equity Method Investments [Line Items]
Purchase of noncontrolling interest				0	50	689
Other Comprehensive Loss, Net of Tax [Abstract]
Unrealized net foreign currency translation losses				(2,176)	(1,738)
Unrealized net investment gains on available for sale investments				33	12
Total accumulated other comprehensive loss				(2,143)	(1,726)
Subsequent Event [Member]
Cash Dividends [Abstract]
Dividends paid	$ 900
Noncontrolling Interest [Member]
Cash Dividends [Abstract]
Cash dividends declared				$ 0	$ 0	$ 0
Noncontrolling Interest [Member] | Gustavson [Member]
Schedule of Equity Method Investments [Line Items]
Interest purchased					7.20%
Purchase of noncontrolling interest					$ 300
Purchase of noncontrolling interest, 1st installment					100
Purchase of noncontrolling interest, three annual installments					$ 200
Number of annual installments | Installments					3
Interest on promissory notes					6.00%
Increase in indirect ownership					83.60%
Noncontrolling Interest [Member] | Walsh [Member]
Schedule of Equity Method Investments [Line Items]
Interest purchased						10.50%
Purchase of noncontrolling interest						$ 1,800
Number of separate transactions | Transaction						3
Purchase of noncontrolling interest, 1st installment						$ 800
Purchase of noncontrolling interest, 2nd and 3rd installment						$ 500
Number of annual installments | Installments						2
Interest on promissory notes						3.25%
Increase in indirect ownership						100.00%
Class A [Member]
Class A and Class B common stock [Abstract]
Percentage equity holders entitled to elect Board of Directors				25.00%
Minimum percentage of the number of outstanding Class A shares to combined classes of shares				10.00%
Voting power of Class A common share holders to the Class B common share holders				0.1
Stock Repurchase [Abstract]
Number of shares authorized to be repurchased (in shares) | shares				122,918			200,000
Remaining number of shares authorized to be repurchased (in shares) | shares				77,082
Number of share acquired (in shares) | shares				0	0	16,091
Acquisition cost						$ 200
Class A [Member] | Noncontrolling Interest [Member] | Walsh [Member]
Schedule of Equity Method Investments [Line Items]
Common stock issued, new shares (in shares) | shares						0.5
Class B [Member]
Class A and Class B common stock [Abstract]
Number of Class B shares to be converted into Class A shares (in shares) | shares				1