Fair Value - Estimated Fair Value of Financial Instruments (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	$ 0	$ 0
Level 1 | Accrued liabilities | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	0	0
Level 1 | Accrued liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	0
Level 1 | Deferred costs and other assets | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	0
Level 1 | Other long-term liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(1,416)	(1,586)
Level 2 | Accrued liabilities | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(1,126)	(1,586)
Level 2 | Accrued liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(173)
Level 2 | Deferred costs and other assets | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	12
Level 2 | Other long-term liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(129)
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	0	0
Level 3 | Accrued liabilities | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	0	0
Level 3 | Accrued liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	0
Level 3 | Deferred costs and other assets | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	0
Level 3 | Other long-term liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	0
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(1,416)	(1,586)
Estimated Fair Value | Accrued liabilities | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(1,126)	(1,586)
Estimated Fair Value | Accrued liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(173)
Estimated Fair Value | Deferred costs and other assets | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	12
Estimated Fair Value | Other long-term liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(129)
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(1,416)	(1,586)
Carrying Amount | Accrued liabilities | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(1,126)	(1,586)
Carrying Amount | Accrued liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	(173)
Carrying Amount | Deferred costs and other assets | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	12
Carrying Amount | Other long-term liabilities | Foreign currency forward exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative assets (liabilities), at fair value	$ (129)