Stock-Based Benefit Plans (Tables)

3 Months Ended

Jan. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation expense recognized and estimated amount to be recognized

		September 30,		September 30,
	2012		2011
Three months ended January 31:	$	5,626	$	5,373

		September 30,		September 30,
	January 31, 2012		October 31, 2011
Aggregate outstanding Stock Price-Based RSUs		706,000		706,000
Cumulative unamortized value of Stock Price-Based RSUs (in thousands)	$	4,081	$	4,929

Summary of aggregate number and unamortized value of outstanding RSUs

		September 30,		September 30,
	2012		2011
Three months ended January 31:	$	314	$	27

		September 30,		September 30,
	January 31, 2012		October 31, 2011
Aggregate outstanding RSUs		138,814		30,994
Cumulative unamortized value of RSUs (in thousands)	$	2,275	$	379

Weighted-average assumptions and the fair value used for stock option grants

	September 30,	September 30,
	2012	2011
Expected volatility	44.20% – 50.24%	45.38% – 49.46%
Weighted-average volatility	46.99%	47.73%
Risk-free interest rate	0.78% – 1.77%	1.64% – 3.09%
Expected life (years)	4.59 – 9.06	4.29 – 8.75
Dividends	none	none
Number of options issued (in thousands)
Weighted-average grant date fair value per share of options granted	$8.70	$7.94

Performance-based restricted stock units

		September 30,		September 30,
	2012		2011
Three months ended January 31:	$	3,522	$	4,588

Stock price-based restricted stock units

		September 30,
	2012
Estimated number to be issued		350,000
Closing price of the Company’s common stock on date of issuance	$	20.50
Estimated aggregate fair value of Performance-Based RSUs issued (in thousands)	$	7,185
Performance-Based RSU expense recognized in the three months ended January 31, 2012 (in thousands):	$	936
Unamortized value of Performance-Based RSUs at January 31, 2012 (in thousands):	$	6,249

Non-performance based restricted stock units

		September 30,
Three months ended January 31, 2012	$	848
Three months ended January 31, 2011	$	752

Employee Stock Option [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation expense recognized and estimated amount to be recognized

		September 30,		September 30,
	2012		2011
Number of RSUs issued		107,820		15,497
Closing price of the Company’s common stock on date of issuance	$	20.50	$	19.32
Aggregate fair value of RSUs issued (in thousands)	$	2,210	$	299