v2.4.0.6

Balance Sheet Details (Computer Software, Net Book Value) (Details) (USD $) In Millions, unless otherwise specified	Jan. 27, 2012	Apr. 29, 2011
Balance Sheet Details [Abstract]
Computer software	$ 154.0	$ 88.3

X

- Details

Name:	ntap_BalanceSheetDetailsAbstract
Namespace Prefix:	ntap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Net book value computer software.

+ References

No definition available.

+ Details

Name:	ntap_NetBookValueComputerSoftware
Namespace Prefix:	ntap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant