Net Income Per Common Share (Tables)

12 Months Ended

Jul. 31, 2011

Net Income Per Common Share (Tables) [Abstract]

Reconciliations of the numerator and denominator of the basic and diluted per share

	Years ended July 31,
	2011			2010			2009
Numerator
Net income (numerator for basic and diluted Class A net income per share)	$	108,652		$	81,956		$	70,122
Less:
Restricted stock dividends		(223	)		(147	)		(144	)
Numerator for basic and diluted Class A net income per share	$	108,429		$	81,809		$	69,978
Less:
Preferential dividends		(820	)		(816	)		(823	)
Preferential dividends on dilutive stock options		(6	)		(11	)		(11	)
Numerator for basic and diluted Class B net income per share	$	107,603		$	80,982		$	69,144
Denominator:
Denominator for basic net income per share for both Class A and B		52,639			52,402			52,559
Plus: effect of dilutive stock options		494			544			307
Denominator for diluted net income per share for both Class A and B		53,133			52,946			52,866
Class A common stock net income per share calculation:
Basic	$	2.06		$	1.56		$	1.33
Diluted	$	2.04		$	1.55		$	1.32
Class B common stock net income per share calculation:
Basic	$	2.04		$	1.55		$	1.32
Diluted	$	2.03		$	1.53		$	1.31