Stock-based compensation (Tables)

3 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of assumptions for stock options granted during period

We used the following assumptions for our options granted during the three months ended December 31, 2012:

Expected life of options	5.0 years
Expected volatility	46.15		%
Expected discrete dividends	—
Weighted average risk-free interest rate	0.63		%
Weighted average fair value	$	5.39

Schedule of stock options and SSARs outstanding, as well as related activity

The following table summarizes stock options and SSARs outstanding as of December 31, 2012, as well as activity during the three months then ended:

	Three Months Ended
	December 31, 2012
	Shares		Weighted- Average Exercise Price
Outstanding at beginning of period	429,965		$	40.80
Granted	155,565		13.33
Expired	(1,703	)	104.19
Forfeited	(1,970	)	19.08
Outstanding at end of period	581,857		$	33.35
Exercisable at end of period	301,795		$	50.33
Vested or expected to vest in the future	580,353		$	33.39

Schedule of nonvested stock awards activity

Activity relating to nonvested stock awards, including the Performance Shares for the three months ended December 31, 2012 is as follows:

	Three Months Ended
	December 31, 2012
	Shares		Weighted Average Grant Date Fair Value
Beginning of period	323,335		$	19.61
Granted	92,592		10.26
Vested	(31,653	)	10.80
Forfeited	(3,093	)	16.19
End of period	381,181		$	18.10