Equity (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended		3 Months Ended
	Nov. 30, 2012	Oct. 31, 2012	Oct. 31, 2012	Oct. 31, 2011
Changes in the components of equity
Balance			$ 102,725
Dividends declared ($0.75 per share)	(13,700)	(3,400)	(17,125)
Restricted Class B common stock purchased from employees			(48)
Repurchases of Class B common stock through repurchase program			(778)
Distributions to noncontrolling interests			(400)
Stock-based compensation			2,225	684
Comprehensive income:
Net income			4,168	(5,073)
Foreign currency translation adjustments			1,628	(794)
Comprehensive income			5,796	(5,869)
Balance		92,395	92,395
Parent [Member]
Changes in the components of equity
Balance			102,230
Dividends declared ($0.75 per share)			(17,125)
Restricted Class B common stock purchased from employees			(48)
Repurchases of Class B common stock through repurchase program			(778)
Distributions to noncontrolling interests
Stock-based compensation			2,037
Comprehensive income:
Net income			3,614
Foreign currency translation adjustments			1,636
Comprehensive income			5,250
Balance		91,566	91,566
Noncontrolling Interest [Member]
Changes in the components of equity
Balance			495
Dividends declared ($0.75 per share)
Restricted Class B common stock purchased from employees
Repurchases of Class B common stock through repurchase program			0
Distributions to noncontrolling interests			(400)
Stock-based compensation			188
Comprehensive income:
Net income			554
Foreign currency translation adjustments			(8)
Comprehensive income			546
Balance		$ 829	$ 829