Leases Leases (Details Textual) $ in Millions	Feb. 29, 2020 USD ($)
Leases [Abstract]
Lessee, Operating Lease, Lease Not Yet Commenced, Undiscounted Amount	$ 5.5

Lessee, Operating Lease, Lease Not Yet Commenced, Undiscounted Amount

No definition available.

Name:	apog_LesseeOperatingLeaseLeaseNotYetCommencedUndiscountedAmount
Namespace Prefix:	apog_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant