Segment Information (Detail 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Revenue recognition
Increase (decrease) in operating income	$ (8,077)	$ 7,179
Increase (decrease) in net income	$ (5,414)	$ 5,162
Increase (decrease) in net income per common share (in dollars per share)	$ (0.20)	$ 0.19
Unallocated corporate expenses and other
Revenue recognition
Increase (decrease) in operating income	$ (8,500)	$ (2,200)
Expense related to the development of ERP system	5,300	300
Change in estimated total costs | Adjustment
Revenue recognition
Increase (decrease) in operating income	(2,400)	(10,800)
Increase (decrease) in net income	$ (1,500)	$ (6,000)
Increase (decrease) in net income per common share (in dollars per share)	$ (0.06)	$ (0.22)