Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2012
Net income	$ 36,084		$ 29,906		$ 25,989
Other comprehensive income (loss):
Unrealized gain (loss) on pension plan obligation	(1,070)	[1]	6,337	[1]	1,176	[1]
Tax effect of unrealized gain (loss) on pension plan obligation	463		(2,577)		(480)
Total other comprehensive income (loss)	(607)		3,760		696
Total comprehensive income	$ 35,477		$ 33,666		$ 26,685

[1] These items are included in the computation of net periodic pension cost. See Note 12-Employee Benefit Plan.