Earnings Per Share (Tables)

9 Months Ended

Apr. 30, 2013

Earnings Per Share [Abstract]

Summary of Weighted-average number of shares used in the calculation of basic and diluted earnings per share

	Three Months Ended April 30,				Nine Months Ended April 30,
	2013		2012		2013		2012
	(in thousands)
Basic weighted-average number of shares		20,905		21,041		20,847		20,633
Effect of dilutive securities:
Non-vested restricted Class B common stock		1,455		1,043		1,331		—
Diluted weighted-average number of shares		22,360		22,084		22,178		20,633

Shares excluded from the diluted earnings per share computations

	Three Months Ended April 30,				Nine Months Ended April 30,
	2013		2012		2013		2012
	(in thousands)
Stock options		703		565		703		704
Non-vested restricted Class B common stock		—		—		—		1,758
Shares excluded from the calculation of diluted earnings per share		703		565		703		2,462