Deferred Revenue (Detail) (USD $) In Thousands	Jun. 30, 2011	Sep. 30, 2010
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 183,455	$ 142,340
Long-term deferred revenue	81,502	76,598
Maintenance Revenue
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	98,071	90,969
Long-term deferred revenue	20,274	12,902
Unearned Revenue
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	85,384	51,371
Long-term deferred revenue	$ 61,228	$ 63,696