Debt - Interest Rates - Additional Information (Detail)	6 Months Ended
	Mar. 31, 2014
Debt Instrument [Line Items]
Interest rate applicable to overdue principal	2.00%
Revolving Credit Facility fee	0.50%
Revolving Credit Facility
Debt Instrument [Line Items]
Revolver Libor rate plus Election Rate	2.00%
Revolver Base rate plus Election Rate	1.00%
Interest rate applicable to overdue principal	2.00%