Pension Plans (Tables)

6 Months Ended

12 Months Ended

Mar. 31, 2013

Sep. 30, 2012

Pension Plans

Components of net periodic pension cost (benefit)

The components of net periodic pension cost (benefit) are as follows (in thousands):

	Six Months Ended						Three Months Ended
	March 31,						March 31,
	2013			2012			2013			2012
Service cost	$	276		$	254		$	136		$	127
Interest cost	4,461			4,782			2,217			2,391
Expected return on plan assets	(5,834		)	(5,046		)	(2,900		)	(2,523		)
Amortization of actuarial loss	907			796			450			398
Administrative expenses	38			42			19			21
Net pension cost (benefit)	$	(152	)	$	828		$	(78	)	$	414

The components of net periodic pension cost were as follows (in thousands):

	Years ended September 30,
	2012			2011			2010			2009
				(As restated)			(As restated)			(As restated)
Service cost	$	508		$	550		$	4,167		$	2,614
Interest cost		9,565			9,387			9,121			9,759
Expected return on plan assets		(10,091	)		(9,979	)		(9,334	)		(9,569	)
Amortization of actuarial loss		1,593			985			917			—
Curtailment charge		—			—			693			—
Administrative expenses		82			85			92			100
Net pension cost	$	1,657		$	1,028		$	5,656		$	2,904