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Reconciliation of Numerators and Denominators of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Numerator for diluted and basic earnings per share:
Net income	$ 20,751	$ 18,495	$ 37,728	$ 41,916
Denominator - share:
Basic weighted-average shares	34,500	35,664	34,705	35,350
Effect of dilutive securities	811	828	965	968
Diluted weighted-average shares	35,311	36,492	35,670	36,318
Earnings per share:
Basic	$ 0.60	$ 0.52	$ 1.09	$ 1.19
Diluted	$ 0.59	$ 0.51	$ 1.06	$ 1.15

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