Nature of Operations and Basis of Presentation (Details) $ in Millions	6 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2015 USD ($)	Jun. 30, 2015 item	Jun. 30, 2014	Sep. 30, 2014 USD ($)
Nature of Operations and Basis of Presentation
Number of building materials segments		2
Percentage of total revenue and cost of revenue for services		9.00%	11.00%
Reclassification of debt issue costs to offset related debt liabilities | $	$ 10.6			$ 7.1